[Bug-gsl] const args for some permutation and multimin functions

[Justin Lenzo]

Dear GSL Developers:

There are a few routines that I have noticed should probably take pointers
to constant objects, because they do not actually change the underlying
data.  Attached please find a patch that modifies the definitions of a few
cases:

gsl_permutation_valid
gsl_multin_fdfminizer_x
gsl_multin_fdfminizer_dx
gsl_multin_fdfminizer_gradient
gsl_multin_fdfminizer_minimum

Note that the documentation for the fdfminimizer routines describes them
as taking a constant object, but in the code they do not.

My apologies if I have not made the patch correctly or if there are issues
that I am neglecting to consider.

Thank you,
Justin Lenzo

gsl-cvs-diff-20071112.diff
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