REM: Remove benchmarks files.

The files are very basic, old benchmarks testing numpy against numeric
and numarray. The competitors are almost defunct and, while benchmarks
are awesome, we really need a more polished and complete framework that
runs against the current competition. I think the early results from
these benchmarks were posted, maybe even presented, and could be found
in a search.

Closes #3088 ;) So old a tuple parameter was used.
Merge pull request #3101 from charris/remove-benchmarks

REM: Remove benchmarks files.