Add Valuation::getSatValue() so that theories can access the current

Add Valuation::getSatValue() so that theories can access the current
(propositional) assignment for theory atoms.

Fixed Debug/Trace as discussed in bug ticket #252 and on the mailing list.
This implementation leads to some compiler warnings in production builds,
but these will be corrected in coming days.  There appears to be a small
speedup in the parser as a result of this fix:

  http://goedel.cims.nyu.edu/regress-results/compare_jobs.php?job_id=1902&reference_id=1886&p=5

Cleaned up a few CD Boolean attribute things.

Various small fixes to coding guidelines / test coverage.

This commit:
* Resolves bug 252 (tracing not disabled in production builds)
* Resolves bug 254 (implement CDAttrHash<>::BitIterator::find())