[giac] removing ggbtmpvarx/y/y'/z (inequality fix-ups not working)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26374 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3408: quick fix bug in the previous commits

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26375 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure EuclidianSettings are initialized with correct colors

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26376 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e