Release 3.2.0 of OptimPack

• Status returned by BOBYQA, COBYLA, and NEWUOA algorithms are now enumerations.

• Names of functions, types, and macros no longer start with an underscore (reserved to future development of the C language). Names of types, structures, and enumerations no longer have a _t suffix. Names of opaque structures have a trailing underscore. File tools/update_3p1_to_3p2 provides a simple Perl script to make the necessary changes in your code.