Testsuite and validate changes

[Thomas Miedema]

All,

I made the following changes today:

* `make accept` now runs all tests for a single way (instead of all ways)
* `make test` now runs all tests for a single way (instead of all ways)
* `./validate` now runs all tests for a single way (instead of skipping
some tests)
* Phabricator now runs all tests for a single way (instead of skipping some
tests)

You can run `make slowtest` in the root directory, or `make slow` in the
testsuite directory, to get the old behavior of `make test` back.

More information:
*
https://ghc.haskell.org/trac/ghc/wiki/Building/RunningTests/Running#Speedsettings
* https://phabricator.haskell.org/D1178
* Note [validate and testsuite speed] in the toplevel Makefile

Thanks,
Thomas
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