This removes some modifications that the theories make to the simpset
and other global context, which slightly reduces breakage when importing
AutoCorres into other theories.
Unfortunately, some of the tests/examples seem to rely on specific
modifications to simp and wp, so removing those will be harder.
Also some simplification stages still seem to use the global simpset
instead of AUTOCORRES_SIMPSET; need to debug later.
This should (finally) close issue JIRA VER-321. Unfortunately it also breaks some other things,
such as heap_abs_syntax, which we'll need to examine later.
Gerwin Klein
Japheth Lim
David Greenaway
Matthew Fernandez
Gerwin Klein