Use fiveam for testing.

Hi John,

I've migrated the existing uncommented tests to fiveam. The `tests` directory contains the package definition, fiveam suite and the existing tests, the other file on the top-level was deleted. All tests can be run by using the ASDF facility, i.e. `(ASDF:TEST-SYSTEM 'CL-TUPLES)`.

Also it the amount of warnings is reduced by exporting all symbols directly in the package definition. I've yet to remove the export statements themselves though.

I'll try to get a new macro similar to `CHECK` into fiveam, it seems useful for these kind of mass comparisons, also I've to check how logging during tests is supposed to work, but that is for later.

Cheers,
Olof