small issues in the ChainProcessor system. Some tests ending in .BAK
should be runnable but can't for now because of a memory leak somewhere
in the framework.

Solvers wrap solvers or factories, depending on the needs.
Factories no longer wrap factories, except for the special case of
timeoutsolverfactories (it does it in a typesafe way though).

Fix TupleRewrite with new posts, fix ScopeSimplified, Fix pretty printer

- RewritingSolver
- DNFSolver
- UnrollingSolver

Refactored the condition abduction code, refactored InSynth code out of Leon, and added the InSynth core library, with substantial amount of fixing and clearning sources, tests, and testcases

Refactoring and fixes for compliance with the rule framework (huge commit and subsequent fixes in the oopsla-artifact branch)

Refactored verifier into concrete and timeout one, added generation of input examples with fuzzying, expression filter detects according to expression structure, added some benchmarks for the paper

Changed the verification condition generation, mofidified filtered of candidates, implemented verifier timeout as evidence of validity

Changed checking for counterexample implications from verification to evaluation, added evaluation strategies (default and codegen), some heuristics, measurements

Added added necessary sources and tests for insynth and condition abduction, and two synthesis rules (immediate and deferred instantiation)

Unlocking reused, already-unlocked blockers would result in a no-op
while still keeping this blocker into the list of blockers to address.
This patch makes sure that reused, unlocked blockers are excluded from
the worklist.