Disallow \n, \r, \t in Aspect names.
While it's a bit non-trivial to enter these in the first place, succeeding in doing so will easily result in broken project files - you just have to add a column with such a name into a graph.
Closes bug #3003662.
Authored by: knut_f 2010-10-09
Parent: [r1341]
Child: [r1343]
