#3392 Points tab data to spreadseet is ok.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34470 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3392 fix interval copy to spreadsheet

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34471 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3392 f(x) -> y(x) rename at spreadsheet copying.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34472 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e