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Closes issue #315 (https://github.com/DynareTeam/dynare/issues/315)

We now have the `calib_smoother' command.

 - at the end of the computation, don't display all preprocessor warnings but
   only their number
 - also display if there has been a MATLAB/Octave warning (counting their
   number does not seem feasible). Closes #181
 - add new "nowarn" option to disable all warnings. Closes #301

Closes: #276

Replace them by equivalents in M_ (and an extra one: M_.dynamic).

IMPORTANT POINT: oo_.dr.npred used to count both purely backward and mixed/both
variables. This was the cause of lots of confusion. The new M_.npred only
counts purely backward variables.

We now have the following indentities:

M_.npred + M_.nboth + M_.nfwrd + M_.nstatic = M_.endo_nbr
M_.nspred = M_.npred + M_.nboth
M_.nsfwrd = M_.nfwrd + M_.nboth
M_.ndynamic = M_.npred + M_.nboth + M_.nfwrd

Closes: #205

Added the possibility to write graph_format=none, in which case the graphs are displayed (provided nograph and nodisplay options are not used) but not saved.

- fix support for filenames with extension (.m, .mat, .xls), since the manual
  and the bison grammar both support it
- fix support for XLS files under Octave
- add support for XLSX files
- run test for loading XLS files

with discretionary_policy

in model statement