Initialize arrays used by MA27 to zero.

Previously, the arrays were not initialized, which is Ok according to
MA27 documentation, but in an abundance of caution (and given that
MA27 still changes), initialize them to zero.
Throw an exception if MA27 cannot factor a matrix.

OOQP tries several times to factor the primal-dual matrix, relaxing
parameters and increasing the size of scratch arrays.  If, ultimately,
the matrix cannot be factored, the downstream code fails, often
crashing.   Throw an exception and stop OOQP gracefully instead.
Update MANIFEST and INSTALLED-MANIFEST.

There were several differences in files due to an updated version
of doxygen.
Have svm-gondzio.exe accept --print-solution.

Previously, it understood --print_solution, with an underscore, but
the usage message suggested that --print-solution was correct.  Accept
either.
Bump OOQP version to 0.99.25.

Update NEWS to document changes.