+ - ocamlgsl version number now indicates the required major+minor GSL
+ - support for gsl_stats_correlation
- Minor changes to improve installation and to fix stack overflows
when dealing with extremely large optimization problems.
- add Gsl_randist.binomial_knuth, add Gsl_multifit._linear_svd
- make several record types 'private'. This disallows building bogus values
that could crash the program.