added new matchers for lk proof creation exceptions (you get the parent proof which you can send to prooftool), bug fixing in lk proof substitutions, fixed a bug in fol: And(f:HOLFormula,t) did match but threw a casting exception. we do only match against And(s:FOLFormula,t:FOLFormula) instead.

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1731 85d21ef8-add0-11de-ae77-5bfb9c5a3f34