Adding two files of documentation for pair potentials.
Added interactions.dox page
Integrating documentation of pair and bond interactions.
Moving cutoff test outside forceOverR in pair interactions.
Merge branch 'devel' into cutoff
Adding cutoffSq function to CompensatedPair template
Minor fix in src/makefile.
Adding documentation for angle classes.
First try dividing Atom class. Passes unit tests, but ddSim doesn't
work.
Further tweaks, but still buggy.
Still tweaking DdMd::AtomStorage after atom division - still buggy.
Fixed bug in Atom class. Simulation runs correctly.
Fixing ddMd tests and memory usage reporting.
Added extra checks to AtomDistributor.