[giac] enable Giac for webstart

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26271 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] add IFactor, CIFactor

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26272 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3337: One little fix and two things something like fixes, but doesn't help much in this ticket

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26273 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e