Set Constant's normal form and other short fixes

Other short fixes:
* use debug tag "theory::assertions::fulleffort" to dump assertions only at FULL_EFFORT
* theoryof-mode fix in smt_engine.cpp
* hack in TheoryModel::getModelValue [TODO: notify Clark/Andy]
* Lemma generation when it rewrites to true/false fix
* TermInfoManager::addTerm(..) fix
* Move SUBSET rewrite to preRewrite
* On preRegister, queue up propagation to be done upfront
** Hospital4 fails when all other fixes have been applied but not this one. Good to have an actual benchmark which relies on this code.
* TheorySetsProperties::getCardinality(..) fix

Thanks to Alvise Rabitti and Stefano Calzavara for reporting some of these; and to Morgan and Clark for help in fixing!
Merge pull request #70 from kbansal/sets-for-merge-squashed

Set Constant's normal form and other short fixes