Need absolute PYTHONPATH for scripts

[jmoore]

Adding a workaround to omero/processor.py:

+        # WORKAROUND
+        # Currently duplicating the logic here as in the PYTHONPATH
+        # setting of the grid application descriptor (see etc/grid/*.xml)
+        # This should actually be taken care of in the descriptor itself
+        # by having setting PYTHONPATH to an absolute value. This is
+        # not currently possible with IceGrid (without using icepatch --
+        # see 39.17.2 "node.datadir).
+        self.env.append("PYTHONPATH", os.path.join(os.getcwd(), "lib"))

Optimal would be to simply start using icepatch such that all nodes only need:

  icegridnode --Ice.Config=NODENAME.config

and they then download their configuration and are ready to go using ${node.datadir}.