[giac] #1335 add regroup() so that r*r^n -> r^(n+1)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25902 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Automatic update of propset svn:ignore via for svnignore.txt's by svnignore

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25903 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] make sure Factor[-15] works again

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25904 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Avoid clone for GWT compatibility

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25905 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] add is_polynomial to check if an expression is polynomial with respect to a variable. JS complex sqrt changed to evalf argument if modulus is not simple.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25906 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25907 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e