[giac] fix for ToPolar[(1, sqrt(3))] (and hack for Unicode.IMAGINARY -> i removed)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25263 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use 3D conic as a region in 3D view

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25264 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove debug()

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25265 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Case input are undefined

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25266 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use conic as a region in 3D view

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25267 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e