1. Deprecate NewtonIntegrator::homotheticCellResize in favor of Cell::homoDeform (compatibility interface with warning)
2. Add the possibility of homothetically changing positions rather than velocities; avoid the meanfield/fluctuation velocity jazz at the expense of vel not being time derivative of pos 
3. Add PBC tests for the previous variant
4. Add defThreads arg to scons, which, if specified, gives default number of threads for simulations, if not overridden with -j
5. Fix a few example scripts, more work ahead come (please help!)
6. Add regression tests for saving/loading yade objects; on maverick, this makes the unregistered class to re-surface (!!)

BTW Bruno, can you run --test and fix chained cylinders attributes you changed?