Staying with JPype 0.6.* for the time being

New JPype version breaks PyJAPC with error:

AttributeError: type object 'cern.japc.ext.inca.IncaConfigurator' has no attribute 'clientAccelerator'

This PR limits JPype dependency to 0.6.* so that the newer version does not sneak into the fresh environment.

approved this merge request

Fine for me.

merged

mentioned in commit 894e72d2