Applied patch to correct conversion errors when reading files for many non-"C" locale...

Applied patch to correct conversion errors when reading files for many non-"C" locales, i.e. locales where commas are used as decimal points.
Provided by Emmanuel Pacaud (emmanuelp@sourceforge.net).

Additionally modified, to allow locale format for in xml files to be honored and to honor spaces between value and units.

All values written by glabels are now guaranteed to be in the "C" locale.

git-svn-id: https://glabels.svn.sourceforge.net/svnroot/glabels/trunk@305 f5e0f49d-192f-0410-a22d-a8d8700d0965