[Couenne] Couenne produces a lot of output on verbosity level 0

[victor.zverovich at gmail.com]

Hello,

I've noticed that Couenne produces a lot of output on verbosity level 0
(outlev=0). For example:

ampl: model 3pk.mod;
ampl: option solver couenne;
ampl: option solver_options 'outlev=0';
ampl: solve;
Couenne 0.5.3 -- an Open-Source solver for Mixed Integer Nonlinear
Optimization
Mailing list: couenne at list.coin-or.org
Instructions: http://www.coin-or.org/Couenne
couenne:
ANALYSIS TEST: Couenne: new cutoff value 2.0236538579e+04 (0.010316 seconds)
NLP0012I
              Num      Status      Obj             It       time
      Location
NLP0014I             1         OPT 1.7201186       10 0.004382
Couenne: new cutoff value 1.7201185696e+00 (0.018883 seconds)
Loaded instance "/tmp/at4272.nl"
Constraints:            0
Variables:             30 (0 integer)
Auxiliaries:           85 (0 integer)

Coin0506I Presolve 234 (-15) rows, 100 (-15) columns and 638 (-30) elements
Clp0006I 0  Obj 0.057685049 Primal inf 199.91031 (115)
...

Normally outlev=0 disables all the solver output except for solve and error
messages:

ampl: option solver minos;
ampl: solve;
MINOS 5.51: optimal solution found.
0 iterations, objective 1.72011857
Nonlin evals: obj = 3, grad = 2.

It would be nice if Couenne followed the same convention.

Thanks,
Victor
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