Changelog:
===========
New Features
------------
Added support for data table formulae
Mapped chartspace graphical properties to charts for advanced formatting
Bugfixes
---------
#1156 Table filters are always overriden
#1360 Can't read some ScatterCharts if the x-axis is not numerical
#1786 NamedStyles share attributes - mutables gotcha
#1851 Allow print area to be set to None
#1852 Worksheet for print title and print areas can't be found
#1853 Custom document properties that are strings can be empty
#1858 ConditionalFormatting lost when pivot table updated
#1864 Better handling of defined names
#1912 Excel doesn't like xmlns:space on nodes with only whitespace, which it treats as empty.
#1942 Exception when print areas use table references.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
