hopefully improve performance a tad.
base/stats/mysql.cc:
- it's not called sample anymore, it's called tick
- don't bother to cleanup deleted runs. Doing this for each run
is not necessary, it can be done all at once
- don't query for a bin id every time, just do it once.
- use locking in a few places to prevent two processes from
stepping on eachother.
- don't duplicate subdata ids. use -1,y and x,-1
base/stats/mysql.hh:
It's not called sample anymore, it's called tick
--HG--
extra : convert_revision : 95de8498b627c9175da28a66604ec7c719f7804c
6999918dd4