TST: Enable remaining special tests against boost data files

expinti_data_long.txt, removed, all values exceed the range of a double
several data files regenerated; existing files did not load due to
parse errors.
MAINT: move locally generated test data files to their own dir.

and out of the data taken from boost.
GEN: special: regenerate test data npz
TST: special: bump tolerances in tests
Merge pull request #3999 from ewmoore:enable_boost_tests

TST: test against all of boost data files

In special, enable test against all of the data files from boost. Things
that seem truely awful are marked as known failures. Some stuff could
probably use a look that isn't marked though, some of the stats
functions from I guess cdflib seem maybe not as good as they could be.

Unfortunately I suspect we will find some of these fail on other
platforms with these limits, just based on the commits to test_data.py
over the years.

I also move our locally generated test data to its own directory.