GCS: fix for TLMap crash on OSX 10.9

For some reason home circle was crashing, going back to previous
code.
GCS: fix font centering for OSX 10.9

A known bug makes the letters not appear centered in the
horizontal axis.
GCS: disable modelview on OSX

This is causing crashes on Maverick. Fixing this isn't a huge
priority because it is removed for Qt5 anyway, but it would
be nice if someone did. A complete description of the crash
can be seen here:
Merge pull request #1009 from peabody124/osx_109_fixes

OSX 10.9 fixes