Merge pull request #310 from HanatoK/v2.4

regtest/drr/rt-eabf/plumed.dat

regtest/drr/rt-noczar/Makefile

regtest/drr/rt-noczar/config

regtest/drr/rt-noczar/eabf_dist.UI.count.reference

regtest/drr/rt-noczar/eabf_dist.UI.grad.reference

regtest/drr/rt-noczar/eabf_dist.UI.hist.grad.reference

regtest/drr/rt-noczar/eabf_dist.UI.pmf.reference

regtest/drr/rt-noczar/eabf_dist.abf.count.reference

regtest/drr/rt-noczar/eabf_dist.abf.grad.reference

regtest/drr/rt-noczar/eabf_dist.abf.pmf.reference

regtest/drr/rt-noczar/plumed.dat

regtest/drr/rt-pmf1d/plumed.dat

regtest/drr/rt-restart/plumed.dat

src/drr/DynamicReferenceRestraining.cpp

src/drr/colvar_UIestimator.h