Moved logfilter.php here from Translate repo

Also update rakkauspipe.sh so it knows the new location of the script.

Change-Id: Ia9142e15e43efb0b424472e5992f3b9c800659c1
Pywikipediabot migrated to Git/Gerrit

Change-Id: Ibfa24880e7e1c66bc30ee2380ef11b589c46e5f1
Merge changes Ibfa24880,Ia9142e15

* changes:
  Pywikipediabot migrated to Git/Gerrit
  Moved logfilter.php here from Translate repo