Added a warning to QMaxSAT in case someone does not store the qmaxsat binary at /bin/qmaxsat

Added TreeGrammarDecomposition.scala, which implements the trat-n grammar decomposition method from Stefan and Sebastian
for a later usage in the n-cutIntroduction. Status: Not finished, yet.

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2083 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
changed qmaxsat that the binary requires to be put somewhere on the PATH than in /bin/

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2084 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
Implemented left-to-right part of the reduction to MinCostSAT in TreeGrammarDecomposition.scala, not yet tested

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2085 85d21ef8-add0-11de-ae77-5bfb9c5a3f34