lift system-independent binning stuff out of Tru64System into System.

lift system-independent binning stuff out of Tru64System into System.

kern/tru64/tru64_system.cc:
    make binned_fns a parameter for System in addition to Tru64System.  Do all the fnEvents setting at the System level, since that is system-independent.
kern/tru64/tru64_system.hh:
    deal with FnEvents in the System, and move some fns over to System.
sim/system.cc:
sim/system.hh:
    lift binning stuff into System out of Tru64System

--HG--
extra : convert_revision : 591dee6f2013f5c43037726c529a00682b5cf82e