this is for plumedcheck

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collectEnergy is a bool and was initialized to 0.0.
That is equivalent to false, so it works correctly,
but does not make much sense.

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I backported the optimized tools/Torsion.cpp from v2.3.

This implementation avoids taking inverse of numbers that could be zero.

Partial tempering/gromos

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this helps when using many Cvs
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and removed NOPBC keyword

See #200

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this will make travis fail..
see #203

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