Translation layer for depselector; messy code in depsolver_gecode.erl
needs cleanup, and there's some interface layer work.
Fix new_problem_with_debug
Minor fixup and debugs.
More tests.
Processor fixes and conversion improvements. PES style constraints still have issues.
Enable more tests.
Test constraints with versions as strings
Add between constraint
Rip out unused code
Add support for between and any constraints
Cleanups and lots of debug code.