Changed pre_exchange flag

git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@9273 f3b2605a-c512-4ea7-a41b-209d697bcdaa
Initialized force in default single()

git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@9274 f3b2605a-c512-4ea7-a41b-209d697bcdaa
fix bug in energy accounting for hybrid pair styles
correct error from broken merge
fix another merge bug
Merge branch 'master' into lammps-icms
git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@9275 f3b2605a-c512-4ea7-a41b-209d697bcdaa
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