Create a branch of Cgl source to do major surgery on CglProbing. Branch here
in case there are modifications to base Cgl source or to test code.
A test commit to make sure I've correctly switched to branches/CglWorking101215
Commit reengineering to date. Should have done this much earlier. Split
out CglImplication and CglProbingRowCut (was row_cut) classes. Split
out debugging methods. Split out snapshot methods.  Split out tighten
methods. Split out main probe method and begin to refactor.  Massively
commented; much may be inaccurate.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.
Change to EPL license notice.