[Couenne] Removing faulty assert

[Francois Margot]

Pietro:

The assert on line 162 of
trunk/Couenne/src/brtanch/CouenneBranchingObject.cpp does not make
sense. It should be removed. The assert is

assert ((brpt - l > .5) || 
        (u - brpt > .5));

as the same condition is used in the following "if-then-else" block.

Francois