[Libreoffice] [PATCH] fix for fdo#30800: Option to display calc gridlines on colored cells

[André Schnabel]

Hi,

this is a patch to fix fdo#30800.

A tiny specification, what has been implemented is at the wiki:
http://wiki.documentfoundation.org/User:Andreschnabel/Spec_Calc_grid_lines_on_colored_background

Comments and questions are welcome, as this is the first time that I
actually *add* some code.

Patch is contributed under LGPLv3+/MPL.

Thanks and regards,

André