Updated odeset/odeget in core

[Rik]

10/9/15

All,

I updated odeset/odeget to remove the dependence on fuzzy_compare.m and
levenshtein.cc.  As far as I can tell by reading documentation the two
functions are now Matlab compatible, but who really knows?  See this
changeset (http://hg.savannah.gnu.org/hgweb/octave/rev/e5f36a7854a5).

Along the way I found that Octave has the following properties in the ODE
options structure which Matlab does not:

Algorithm
Choice
Eta
Explicit
InexactSolver
MaxNewtonIterations
NewtonTol
OutputSave
PolynomialDegree
QuadratureOrder
Restart
TimeStepNumber
TimeStepSize
UseJacobian

Can anyone who solves odes regularly comment whether these are needed
anymore?  Otherwise, I would remove them to lower the number of lines of
code that need to be maintained.

Cheers,
Rik