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Closes #306

Closes #321

 - 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 #296

The "Static" symbol was not exported; instead, it was the non-existing
"Dynamic" symbol which was exported.

This is documented in the reference manual, but was not working.
The change consists in having check.m returning oo_ as 1st output argument, and
having the preprocessor generating the corresponding code.

In StaticModel, deriv_ids are no longer equal to symb_ids; some parts of the
code were relying on that assumption

The new file is <FILENAME>_static_params_derives.m

Closes: #160

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

Closes: #266

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.

This should fix some random crashes of the preprocessor

ms-sbvar: remove unused field removal statements (and set options_.datafile='' in global_initialization)