Fixed handling of weakenings in expansion tree extraction
(axioms with additional formulas still need to be addressed)


git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1857 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
Fixed invalid import


git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1858 85d21ef8-add0-11de-ae77-5bfb9c5a3f34