Stopwatch: implemented a class to make measuring runtime easier
TreeGrammarDecomposition: Applied Stopwatch for time measuring purposes to NCutIntroduction, TreeGrammarDecomposition, MaxSAT, CLI and refactored the code
MaxSAT: Added support for MiniMaxSAT and a corresponding testcase


git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2186 85d21ef8-add0-11de-ae77-5bfb9c5a3f34