changed usage/help output in GAPShell
changed ncutIntro result to list of canonical solutions
added time logging to debug output in TreeGrammarDecomposition and MaxSAT
fixed a bug in TreeGrammarDecomposition leading to possible incomplete set of keys in case of n>=2
added a prettyPrinter function to abbreviate latex output of MCS formulation
refactored debugs/traces

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2136 85d21ef8-add0-11de-ae77-5bfb9c5a3f34