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arbitrary matlab objects.

character, since that is interpreted by matlab as part of an eventual printf()
code.

are empty, leading to MATLAB complaining about output arguments to being
assigned.

are directly the arguments of a mex function.  This way, we avoid the problem
of dlib::matrix objects being created in other threads that internally call
into matlab and mess it up (since matlab is not thread safe in any sense).

just dlib exceptions.

if so.  This way, if you have a long running mex file it will be killable if
it is periodically printing.

streambufs before exiting.

in an exception getting thrown.

function ends.

call_matlab.h into dlib namespace, and also added missing overloads for
call_matlab().

minor things.

inside mex files.  This way, if you use matrix_colmajor or fmatrix_colmajor
in a mex file it will not do any unnecessary copying or transposing.