Ticket #3823: basic features of the spreadsheet context menu are activated

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30057 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] Gcd of polynomials with approx coeff now returns 1, fix overflow for #3838.
sqrt of symbolic complex numbers now expressed in terms of sqrt of reals.


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30058 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3823: object properties in spreadsheet context menu

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30059 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e