[Clp] Problem with ClpModel::addColumns

[David Einstein]

When I run the addColumn example it crashes when performing the
model.dual() on line 129.  As far as I can tell, this happens because the
matrix_ member has 200003 columns, while it is supposed to have 100003
members (the new columns are being created twice once at ClpModel.cpp:2289
where blank columns are created and once at ClpModel.cpp:2598 where the
actual columns are being added).

It is entirely possible that I am misunderstanding something.

Thank you for an amazing piece of code.  The Clp library is amazing.
Deinst
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