GGTApi Login. The beginning.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24794 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] updated unit tests (now includes tests adapted from test project)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24795 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] changes for ggb compat: PrimeFactors, Limit/degree without var argument, cross

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24796 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] attempt to make PrimeFactors and Factors work both, ToPolar output change

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24797 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e