Merge remote-tracking branch 'origin/master' into atomic_units

.travis.yml

regtest/piv/rt-piv-derivatives/Ice8.pdb

regtest/piv/rt-piv-derivatives/Imin.pdb

regtest/piv/rt-piv-derivatives/Makefile

regtest/piv/rt-piv-derivatives/colvar.reference

regtest/piv/rt-piv-derivatives/config

regtest/piv/rt-piv-derivatives/plumed.dat

regtest/piv/rt-piv-derivatives_onlycross/Ice8.pdb

regtest/piv/rt-piv-derivatives_onlycross/Imin.pdb

regtest/piv/rt-piv-derivatives_onlycross/Makefile

regtest/piv/rt-piv-derivatives_onlycross/colvar.reference

regtest/piv/rt-piv-derivatives_onlycross/config

regtest/piv/rt-piv-derivatives_onlycross/plumed.dat

regtest/piv/rt-piv-derivatives_onlydirect/Ice8.pdb

regtest/piv/rt-piv-derivatives_onlydirect/Imin.pdb

regtest/piv/rt-piv-derivatives_onlydirect/Makefile

regtest/piv/rt-piv-derivatives_onlydirect/colvar.reference

regtest/piv/rt-piv-derivatives_onlydirect/config

regtest/piv/rt-piv-derivatives_onlydirect/plumed.dat

regtest/piv/rt-piv-distance/Ice.pdb