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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