TurtleUp command added (#4737)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37637 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
TurtleDown command added (#4737)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37638 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix for ceil/floor


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37639 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Moved round.2 to functions

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37640 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e