[giac] Ellipse/Hyperbola[point,point,number] working

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26532 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] Tangent[point,function]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26533 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fixes for equation

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26534 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
various fixes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26535 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e