Pivottable 3.1.0
* Features
  ZKPVT-100: exporting xlsx with keikai-poi
* Bugs
* Upgrade Notes

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Pivottable 3.0.0 for ZK 10
* Features
* Bugs
  ZKPVT-99: Cannot work with ZK 10
* Upgrade Notes
  + Drop support for Internet Explorer.
  + The Java binary-compatible level is Java 11.

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Pivottable 2.5.3
* Features
* Bugs
* Upgrade Notes

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Pivottable 2.5.2
* Features
* Bugs
  ZKPVT-94: GroupHandler should not apply to data cells when exporting
* Upgrade Notes

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Pivottable 2.5.1
* Features
* Bugs
  ZKPVT-93: wrong page size after setDataFieldOrient
* Upgrade Notes

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Pivottable 2.5.0
* Features
  ZKPVT-29: Frozen head in pivottable (optional) (without IE)
  ZKPVT-29: Support vflex="1"
* Bugs
* Upgrade Notes

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Pivottable 2.4.0
* Features
  ZKPVT-88: export custom sheet names/order/visibility
* Bugs
  ZKPVT-87: XLSX Exporter doesn't export closed headerField state
  ZKPVT-89: exporting creates redundant style elements in xlsx export
  ZKPVT-91: autoColumnSize causes bad performance

* Upgrade Notes
  + ZKPVT-92: PivottableZKPVT-92 iteration over POI node lists causes bad performance
    -> depends on the external jar zpoiex >= 3.9.13

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Pivottable 2.3.0.1
* Features
* Bugs
* Upgrade Notes
  + Fixing a maven packaging problem (no functional changes)

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Pivottable 2.3.0
* Features

* Bugs
  ZKPVT-83: Column header height grows even it is not expanded
  ZKPVT-21: Data Table is not align correctly when TITLE_ROW contains a lot of information (fixed by ZKPVT-83)
  ZKPVT-84: Column labels missing when switching tab (fixed by ZKPVT-83)
  ZKPVT-85: Cannot override sortTrees API in TabularPivotModel

* Upgrade Notes
  + (ZKPVT-85) The hook method TabularPivotModel.sortTrees() was deprecated. 
    Alternative hook methods are provided: 
    - TabularPivotModel.sortRowTree(SimplePivotHeaderTree)
    - TabularPivotModel.sortColumnTree(SimplePivotHeaderTree) 

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August 21, 2014
Pivottable 2.2.0
* Features
  ZKPVT-65: Export to xlsx format as static report
  ZKPVT-76: Allow user to use their own HSSFWorkbook or XSSFWorkbook to export pivottable
  ZKPVT-77: Export to Excel can choose to use custom renderer for data cells
  ZKPVT-80: Excel 2007 becomes the default export format

* Bugs
  ZKPVT-71: Pivottable is broken in Safari 7.0.1
  ZKPVT-72: Pivottable is broken in Chrome 32
  ZKPVT-73: PivotUIEvent returned the header context of the previous row
  ZKPVT-74: Summary should be null if no data
  ZKPVT-75: Export to excel xlsx format file can't be open correctly
  ZKPVT-78: Exported XLS file did not pass Office File Validation when changed ZPOI version to 3.9.4
  ZKPVT-79: Select subtotal function throw NPE if don't select any calculator

* Upgrade Notes
  + The API CellStyleConfigurator.getDateFormat(String) is renamed to CellStyleConfigurator.getDataFormat(String)
  + Exports.exportExcel() supports a new fileFormat "xlsx.static" for exporting to xlsx as static report
  + Export to excel xlsx format may throw an ExcelUnreadableException when the exported file will cause Excel to report an "unreadable content" error
  + Please do not use ZPOI 3.9.4 if need to export to XLS format. Instead, please use ZPOI 3.9.3 or prior, or ZPOI 3.9.5 after 2014/08/15.  
 
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December 10, 2013
Pivottable 2.1.0
* Features
  ZKPVT-68: Compatible with ZK 7

* Bugs
  ZKPVT-66: Column title uses the width of row title
  ZKPVT-67: Exception when adjust column width without data
  ZKPVT-69: Tooltip causes JavaScript Error when no data fields

* Upgrade Notes
  + Pivotable 2.1.0+ is required if upgraded to ZK 7

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Pivottable 2.0.3
* Features

* Bugs
  ZKPVT-57: Pivottable broken with larger page size
  ZKPVT-58: JS error in IE8
  ZKPVT-60: Summary of value field is gone after change layout of pfc
  ZKPVT-61: JS error when mouseover row title in IE8
  ZKPVT-62: JS error when mouseover column title in IE8
  ZKPVT-63: Pivottable broken when data column is shrunk
  ZKPVT-64: Null pointer exception when exporting to xlsx format if field title is different from field name

* Upgrade Notes

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July 16, 2013
Pivottable 2.0.2
* Features
  ZKPVT-48: Subtotals and summary in pivot field control should support i18n
  ZKPVT-49: Hide paging if only one page
  ZKPVT-50: Hide horizontal scroll bar if no need to scroll
  ZKPVT-53: Create ZK Pivottable MyApp Project

* Bugs
  ZKPVT-26: Export grand total followed by pivottable config
  ZKPVT-40: ArrayIndexOutOfBoundsException when removing the first of multiple data fields
  ZKPVT-42: PivotHeaderNode.setOpen() does not update pivottable
  ZKPVT-43: Sizes of "Grand Total For Columns" are in reverse sequence
  ZKPVT-44: Fields should be all UNUSED by default
  ZKPVT-46: Node expansion/collapse should trigger event
  ZKPVT-47: Changing data field orientation caused "/ by zero" exception
  ZKPVT-45: Incorrect Grand Total if no row fields and no column fields

* Upgrade Notes
  + Pivottable#invalidate() should be called after manipulating the model to update pivottable's view

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Pivottable 2.0.1
* Features
  
* Bugs
  ZKPVT-30: Grand Total values do not convert to when you change the position of one of the measures
  ZKPVT-14: column size adjust bar position is not correct
* Upgrade Notes

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June 5, 2012
Pivottable 2.0.0
* Features
  ZKPVT-24: Support export excel 2007 format (which exports to a real pivot table in Excel)
* Bugs
  ZKPVT-23: Export excel too many font problem
* Upgrade Notes
  + New algorithm for TabularPivotModel, which grants a 100%-400% speed boost
    and saves more memory.
  + Calculator type changed. For TabularPivotModel, user should choose Calculator
    from enum StandardCalculator (instead of the old Calculators). 
  + TabularPivotModel#getRawValues() removed along with its new implementation.
  + TabularPivotField#setSummary() are replaced by TabularPivotModel#setFieldSummary().
  + TabularPivotField#setSubtotal() are replaced by TabularPivotModel#setFieldSubtotal().

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Mar 13, 2012
Pivottable 1.1.0
* Features
  ZKPVT-2: Export to Excel
  ZKPVT-20: Enhance PivotFieldControl to support deferred update
* Bugs
  ZKPVT-13: Data header filder label shall respect PivotRenderer
  ZKPVT-19: Add Cell Title in doAfterCompose will cause exception

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Nov 29, 2011
Pivottable 1.0.0
* Features
  ZKPVT-5: Sizable column
  ZKPVT-6: Provide API to specify custom style/class by cell
  ZKPVT-7: Enhance header ordering (sorting) support
  ZKPVT-9: Provide easier UI control for Pivottable 
  
* Bugs
  ZKPVT-3: PagingInfo constructor shall provide information about IllegalArgumentException
  ZKPVT-4: Customize column size doesn't work correctly 

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Pivottable 1.0.0-beta
* Features
  Support 0 to many row/column fields
  Support 1 to many data fields
  Support open/close header node
  Support paging
  Support subtotal
  Support hide/show grand total
  Support events
