runner: remove dump function

we don't use it anyway
runner: make stdout reporter working
reporter: add skeleton for MySQL reporter

Just a skeleton... gosh, if I my commits to this project were
sent to some devel-list and I'd be a reviewer, I would have to
kill myself..
allow more grained input

Allow to run only some .set files or a combination of dir and .set
files. Basically:

./runner --benchmarks=../benchmarks/*.set,tmp/benchs,Arrays.set

should work