1. Rename InteractionDispatchers to InteractionLoop; backwards-compat for python as usual, typedef with deprecated warning in c++; update all scripts and docs to reflect that.
2. Add NozzleFactory, which might be in the future generalized to a generic factory object and a numebr of derived classes with different parameters (such as factory area shape, specification of sphere parameters etc); see scripts/test/shots.py
3. Fix many crashers in the OpenGL code; unbreak particle selection
4. Finalize the MatchMaker class, with convertor from python floats to specify fixed value.
5. MatchMaker is used to specify different coefficients of restitution for different material couples in Ip2_FrictMat_FrictMat_MindlinPhys; viscous constants moved away from Law2_ScGeom_MindlinPhys_Mindlin into MindlinPhys instead.
6. Fix compilation errors caused by unintelligedn 3rd-party Combine builder to scons -- save sombined files to an external file, force refresh of all combined files if the md5 changes. Does not increase compilation time.
7. Add DomainLimiter engine for deleting particles that go ouside some domain (see scripts/test/shots.py)
8. Add DragForceApplier (not yet tested); thans to Stefano for the suggestion.