[giac] translate surd to ^ for limit((5^x+3^x)^(1/x))
timeout checks added, changes related to the TI nspire giac port.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34644 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
First properly working version of the new Relation Tool (not activated yet since it looks ugly on desktop)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34645 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e