[Cbc] Zero-half cuts announcement

[John Forrest]

James,

After digging around a bit, I have put a first version of CglZeroHalf 
into Cgl trunk.

Point Cbc to Cgl/trunk.  To do this copy Dependencies to xxxxxx and edit 
file to have

Cgl               https://projects.coin-or.org/svn/Cgl/trunk/Cgl

Then
svn propset svn:externals -F xxxxxx . (note .). Then do svn up.

You also have to add -DZERO_HALF_CUTS to configure (you may have to do 
make clean).

This should work with Cbc stable 2.8 and trunk.

By default these cuts are off.  To use add to your command line 
-zerohalfCuts root (or other options) or just -zero.  I think it may 
only help on a small subset of problems and may need some tuning.

It is very sad that it took so long to get these cuts into Coin-OR. Here 
I would have thanked Alberto Caprara of Bologna University who provided 
the code, but unhappily he died in a mountaineering accident last year - 
see here for heartfelt tributes from colleagues.

http://albertocaprara.people.ing.unibo.it/gbook.php?page=1

John Forrest