Merge branch 'v2.4' into v2.5

regtest/isdb/rt-jcouplings-mi/atom_forces.reference

regtest/isdb/rt-jcouplings-mi/config

regtest/isdb/rt-jcouplings-mi/force.new.reference

regtest/isdb/rt-jcouplings-mi/minew.reference

regtest/isdb/rt-jcouplings-mi/miorig.reference

regtest/isdb/rt-jcouplings-mi/plumed.dat

regtest/isdb/rt-jcouplings-mi/trajectory.xtc

regtest/isdb/rt-jcouplings/COLVAR.reference

regtest/isdb/rt-jcouplings/config

regtest/isdb/rt-jcouplings/deriv-jccg.reference

regtest/isdb/rt-jcouplings/deriv-jhahn.reference

regtest/isdb/rt-jcouplings/deriv-jhan.reference

regtest/isdb/rt-jcouplings/deriv-jncg.reference

regtest/isdb/rt-jcouplings/plumed.dat

regtest/isdb/rt-jcouplings/trajectory.xtc

src/config/Config.inc.in

src/isdb/Jcoupling.cpp

src/isdb/RDC.cpp

src/vesselbase/ActionWithVessel.cpp