[Coin-bcpdiscuss] Controlling Clp verbosity: a proposal.

[acw at ascent.com]

In response to my query about controlling Clp verbosity in the 
BranchAndCut
example, M. Margot was kind enough to suggest the following:

> Add
> 
> In the file LP/BB_lp.cpp, modify BB_lp::initialize_solver_interface() 
to:
> 
>    OsiClpSolverInterface * clp = new OsiClpSolverInterface;
>    clp->messageHandler()->setLogLevel(0);
>    return clp;

I did something similar to his suggestion, but I did it by adding a new
parameter, which I called BB_LPLogLevel.

Is this something that would be appropriate to migrate back to the 
repository?
I tested it and it works.  Below here I summarize the changes that were
required.

We are new to this community, and would appreciate advice about how to 
propose
changes, and where to look for additional information.

==Details==

(All referenced files are under Examples/BranchAndCut/.)

1. In include/BB_lp_param.hpp, in the struct BB_lp_par, in the enum 
int_params,
   replace "int_dummy" with "LPLogLevel".

2. In LP/BB_lp_param.cpp:
   A. In BCP_parameter_set<BB_lp_par>::create_keyword_list(), after // 
IntPar,
      insert

         keys.push_back(make_pair(BCP_string("BB_LPLogLevel"),
                                  BCP_parameter(BCP_IntPar, LPLogLevel)));

   B. In BCP_parameter_set<BB_lp_par>::set_default_entries(), after // 
IntPar,
      insert

         set_entry(LPLogLevel, 1);

3. In LP/BB_lp.cpp, modify BB_lp::initialize_solver_interface() to:

         OsiClpSolverInterface* clp = new OsiClpSolverInterface;
 clp->messageHandler()->setLogLevel(par.entry(BB_lp_par::LPLogLevel));
         return clp;
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