#3400 TangentTroughPoint command added

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28480 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3400 improvement for functions

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28481 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #3626 ([web] spreadsheet cells not editable in Applets)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28482 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e