* Use scoped_ptr for condition
* Check solver result in unit tests
* Add test for unusual cjust
* Add solver::get_value
* Broken assertion
* Support forbidden interval for coefficient -1
* Rename to neg_cond
* Add some logging utilities
* Implement case of forbidden interval covering the whole domain
* Implement diseq_narrow
* Do not activate constraint if we are in a conflict state
* comments
* Assert that lemma isn't undefined
* Update revert_decision to work in the case where narrowing causes propagation
* Fix case of non-disjunctive lemma from forbidden intervals
* Conflict should not leak outside user scope
* Add guard to decide(), some notes
* Add test case
* Add constraints to watchlist of unassigned variable during propagation
* Move common propagation functionality into base class
* Combine eq/diseq narrow
* Compute forbidden interval for equality constraints by considering them as p <=u 0 (or p >u 0 for disequalities)
* Pop assign_eh
* Fix scoped_ptr_vector constructors, add detach()
* Need to copy the returned lemma
* Add test
* Basic inequality tests
* Return disjunctive lemma to caller
* Add interval class
* Take dependency as const reference
* Compute forbidden intervals for ule-constraints
* Add class for evaluated interval
* We need the evaluated bounds as well
* Don't add constraint to cjust multiple times (hack, to be improved later)
* typo
* More interval helpers
* Add constraint::ult factory function
* Fix forbidden interval condition
* Add solver::has_viable
* Add conflict explanation using forbidden intervals (not yet fully integrated into solver)
