[Coin-contest] Is Sbb stable enough to start work?

[John J Forrest]

I was asked if Sbb was stable enough to start using it.  I did make a mess
of updating Clp which broke everything but it all looks okay now.

I will not be changing Sbb much now.  Future plans include:

a) Fixing bugs
b) Improving Clp
c) The only Sbb related change will be that I intend to add a row indicator
to row cuts, which if set will indicate that that cut can be used to
replace the indicated row rather than just be added as a cut.  This should
improve efficiency.

There are some areas which have not been thoroughly tested.  These include
-

a) Global cuts.  Obviously ones added at root are global, the default for
others is local (and descendants).  This can be changed by user but this
feature has not been thoroughly tested.  If anyone plans to use this
feature, make sure I know ahead of time.
b) Cuts when a node is infeasible.  This was for generating global cuts and
is indicated when the cut generator is added to model.  Again please inform
me if you are going to be using this e.g. bender's cuts.

John Forrest