Grid for pstricks export  (other code by the user of the forum pablgonz)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25472 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix for solving inequality.
Introduce assume(.,real) and assume(.,complex) for real and complex variables (precedence over the complex variables mode). Improves generation of samples of large set of random numbers following binomial or Poisson.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25473 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e