Ticket #3510: option to set columns headers off (no idea why it doesn't work for row headers yet)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27368 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] manually update OSX version of Giac

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27369 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.186.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27370 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Worksheet GUI improvement (test code deleted, load the correct worksheet instead)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27371 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
revert to older giac dll (file missing)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27372 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e