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Reason: using --unicode-literals everywhere is not a good approach.

This reverts commit 323836e9.

futurize --stage1 --unicode-literals `echo $(find -name "*.py*") ./core/main/yade-batch.in ./core/main/yade-oar.in`

make getRoundness() more flexible: empty excludeList is no more needed as input argument; adapt replaceByClumps-example.py and associated part in users manual

Improvements in clump logic - part 5: added Monte-Carlo-algorithm for estimation of clump volumes called getClumpVolume(), added a new method for getting roundness coefficient called getRoundness(), updated examples/clumps/replaceByClumps-example.py

-> part 3: new class clumpTemplate in py/utils.py
   make it possible to create clump templates (python objects)

-> part 4: new method replaceByClumps() in py/wrapper/yadeWrapper.cpp
   replace spheres by clumps using a list of templates and a list of amounts

-> small bug fix in calm() method: now clumps will also be calmed

-> added new example script, that shows usage of clumpTemplate and replaceByClumps()

Thank you all for your help!

https://github.com/yade/trunk/pull/31