#3370 improvement

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27454 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3370 fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27455 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3370 null check

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27456 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] improve/fix ToPoint / ToComplex

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27457 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
StyleBar refactoring

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27458 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e