[Osi] issue in OsiCbc - corrupting bounds

[Lou Hafer]

Matt,

	As far as I know this is a feature of cbc.  There's a thread in the cbc
mailing list (`More problem with re-solving a model', 6 Apr 2009) that talks
about just this issue.  The solution proposed there (dating back to 2008) is to
use the saveReferenceSolver() and resetToReferenceSolver() methods from
CbcModel.

	Hard to say why this developed as it did, except that it's clearly more
efficient in a single-solve use to leave the problem representation in whatever
state it's in at the conclusion of the solve.

						Lou