fixed a bug in prover9 term parsing, double negation does not need brackets anymore (i.e. --P(x) is allowed now)

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1399 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
partially fixed bug 221 - reflexivity is (hopefully) handled correctly now


git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1400 85d21ef8-add0-11de-ae77-5bfb9c5a3f34