don't auto-insert $   $ for latex texts

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23913 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use hidden point in polygon for area tool.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23915 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e