added propositional decomposition rules to ral, a bit of code cleanup in ral, started with embedding of prover9 proofs into ral

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2142 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
fixed prover9 detection code

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2143 85d21ef8-add0-11de-ae77-5bfb9c5a3f34