Refactored Snapshot and Stats to use the Accumulator classes.  Collected
a number of methods into Thermo that belonged there.

Splitting out ifstrstream into a header and an implementation.  This
means that much of the code that depends on it can be compiled only
once and the parallel I/O is concentrated into a few files.  To do
this, a number of files that relied on basic_ifstrstream to load the
mpi header had to be modified to manage their own headers.

removing cruft (atom numbers, do_pot, do_stress) from many modules and
force managers

Almost all of the changes necessary to create OpenMD out of our old
project (OOPSE-4)

End of the Link --> List
Return of the Oject-Oriented
replace yacc/lex parser with antlr parser

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