[Cbc] Logging intermediate solutions

[acw at ascent.com]

Is there a command-line option to make the standard Cbc executable log 
intermediate solutions as they are found?  Using default settings, the 
_fact_ that a solution has been found is logged, but we would like it to 
log the solution itself (printing the values of all nonzero variables).

The reason we want this is that we have a different sort of solver running 
in parallel with Cbc, and we would like to be able to feed it "hints" as 
the solution process proceeds.

Our solution so far has been to actually modify the Cbc main driver loop, 
in the source, to log store each solution as it is found.  But it is risky 
and inconvenient having to repeat this source-surgery every time a new and 
improved version of Cbc appears.  It would be a stabler solution to just 
interact with Cbc through the command-line interface.
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