[giac] convert decimals to exact fractions before sending to giac eg (44/100), rather than sending exact(0.44) (part2, GeoNumeric)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24914 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Pulled up more CAS stuff to allow CAS in Touch

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24915 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Conic section between limited quadric (cone/cylinder) and plane : part 2 (drawing in 2D view, hyperbola label)
3D label for conics

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24916 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e