(issue139) Check that pid is not running if the lock can be aquired If the lock on the lockfile can be aquired it might still be possible that another process is running. So we read the pid from the lockfile and check if another process with the same installation prefix as us is running.

aheinecke@intevation.de=Andre Heinecke
andre.heinecke@intevation.de=Andre Heinecke
bernhard@intevation.de=Bernhard Reiter
rrenkert@intevation.de=Raimund Renkert
wilde@intevation.de=Sascha Wilde
emanuel@intevation.de=Emanuel Schütze