sets translator: fix for dags
sets translate: a different translation using axioms

todo: set logic correctly, split the code for two translators
smt2 parser: tokenize emptyset only if theory enabled
test for prvs commit (tokenize emptyset)

9978c259f30b1f4b2c70c04589a309033a6eb1f6
parseErrorHelper : factor out whole word matching

catches some corner cases, more readable too
Add missing set of braces, fixes --trace.

Also ensure // commented Debug() lines don't get included in Debug/Trace_tags.
Merge pull request #29 from kbansal/alternatefix

Fix for emptyset in smt2 parser, sets translator to quantified logic, misc
Tim's options for QF_LIA and QF_LRA---SOI+approx.
PreRegisterTerm is changed.
Bug fix for string-opt2
PreRegisterTerm is changed.
add delayed length lemmas
merging...
Merge branch 'master' of github.com:tiliang/CVC4