refactored MaxSAT class, added support for ToySat and ToySolver, added testclasses

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2118 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
added documentation to MaxSAT

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2119 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
started to implement applyStat for NCutIntroduction, not tested yet

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2120 85d21ef8-add0-11de-ae77-5bfb9c5a3f34