Gnumeric 1.9.12

Andreas:
	* Add CHOLESKY.
	* Fix ODF background colour export. [#593816]
	* Handle super/subscript in html export. [#593851]
	* Fix crash on unknown chart type. [#594041]
	* Handle ODF import/export of surface plots originally created in 
	  XL [#594041]

Jean:
	* Don't use simple GOData when importing xls files. [#594068]

Morten:
	* Fix menu sensitivity problem.  [#593624]
	* Simplify GnmColor.
	* Fix grab problem.  [Debian #544975]
	* Simplify GnmFont.

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