Cutoff group changes under MPI
in the progress of fixing MPI version of cutoff group
ZConstraint now can support sequential moving. Refactorying is needed to support SMD in ZConstraint
fixes for compatibility
cleaned things with gcc -Wall and g++ -Wall
fix a bug at MPI version of PolicyByMass
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reformmating ZConstraint and fixe bug of error msg printing
Tested MPI version of Z-Constraint Method
Added Z constraint.
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