MINPACK-2 test problems

[jacobwilliams]

I think these are test problems for MINPACK: https://ftp.mcs.anl.gov/pub/MINPACK-2/tprobs/

Need to modernize them and add them to the unit tests.

[jacobwilliams]

FYI: I put the code here so it is easier to study: https://github.com/jacobwilliams/MINPACK-2

I notice there are also other algorithms in there that aren't in regular Minpack. The license is unclear to me though...

[ivan-pi]

Is there any overlap with the problems located here: http://www.netlib.org/uncon/data/? (a list of names can be found in the readme at http://www.netlib.org/uncon/data/readme)

[ivan-pi]

I think the same problems are also used in the CodeLib library (http://elib.zib.de/pub/elib/codelib/en/misc.html) under "Newton TestSet".