Bugfixes in mergerules.
Bugfixes in mergerules.

Corrected problem with insertion of existential quantifiers, corrected
problem with postcontraints that depended on not-fully-defined local
variables.

git-svn-id: 9ecf60ce9baff443e30a0472d3fd222fcb8117cf@8263 7b97033b-253e-4a5c-9b07-e25f9089a9fd

KestrelInstitute/Specware,KestrelInstitute/Specware,KestrelInstitute/Specware,KestrelInstitute/Specware,KestrelInstitute/Specware