[giac] Remove the need to compile with -DGIAC_GGB. Requires initialisation by calling caseval("init geogebra")

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25186 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Adding navigation bar started. (#3246)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25187 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e