[Coin-lpsolver] new patch for ClpModel

[François Galea]

Hello,

I have modified ClpModel a bit further, in order to solve other problems 
I met with it. The patch file is attached, please feel free to tell me 
what you think about the changes, and give suggestions if any.

First problem: when changing row or column names with the copyRowNames 
and copyColumnNames methods, it was only possible to correctly change 
the names when the `first' parameter equals 0. This was already fixed in 
the previous patch I posted on this mailing list, and the fix is still 
present in the new one, so the old one is not useful anymore.

Second problem: when adding rows or columns to an object, the already 
existing names for the previously created rows or columns were 
systematically removed. This is fixed at the end of the `resize' method.

Third problem: when adding rows or columns using a CoinBuild object, no 
rows or columns are added when no values have been provided for these 
rows/columns, which should be possible, for example when adding the very 
first rows or columns to an empty object. This is also fixed (in the 
addRows and addColumns methods which take a CoinBuild argument)

thank you for your attention.

François



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