[giac] make sure output of NSolve/NSolutions always wrapped in a list

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25350 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] remove 3e-2 -> 3E-2 hack (no longer needed)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25351 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e