[giac] improve answer for Factor[(-k x² + 4k x + x³)]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25315 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
bugfix: missing call to setDependencies(); in AlgoDivision

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25319 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] allocating more memory for unit tests

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25321 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e