Better wrapping of filter names

[mikecopperwhite]

At the moment filter names without whitespace are not word wrapped making some graphs very wide.

Possible solutions.

• Option that allows filter name wrapping to break words
• Allow wrapping by breaking words if the filter after word wrapping is still wider than some multiple of the current wrap width.
• Easier ways of renaming filters (issue Rename filters #251) to add spaces to allow word wrapping. The easiest current work around is to save as GRFX, edit the names with a text editor and reload.