Merge branch 'master' of https://github.com/plumed/plumed2

CHANGES/v2.4.txt

regtest/analysis/rt-commit-1/COMMITED.reference

regtest/analysis/rt-commit-1/Makefile

regtest/analysis/rt-commit-1/ala12_trajectory.xyz

regtest/analysis/rt-commit-1/config

regtest/analysis/rt-commit-1/plumed.dat

regtest/analysis/rt-commit-2/COMMITED.reference

regtest/analysis/rt-commit-2/Makefile

regtest/analysis/rt-commit-2/ala12_trajectory.xyz

regtest/analysis/rt-commit-2/config

regtest/analysis/rt-commit-2/plumed.dat

src/analysis/Committor.cpp

src/generic/Print.cpp

src/gridtools/ConvertToFES.cpp

src/mapping/PropertyMap.cpp

user-doc/tutorials/a-trieste-3.txt

user-doc/tutorials/a-trieste-6.txt