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

CHANGES/v2.2.txt

regtest/basic/rt-make-mw/COLVAR.0.reference

regtest/basic/rt-make-mw/COLVAR.1.reference

regtest/basic/rt-make-mw/COLVAR.2.reference

regtest/basic/rt-make-mw/Makefile

regtest/basic/rt-make-mw/config

regtest/basic/rt-make-mw/main.cpp

regtest/basic/rt-make-mw/plumed.0.dat

regtest/basic/rt-make-mw/plumed.1.dat

regtest/basic/rt-make-mw/plumed.2.dat

regtest/crystallization/rt-spherical-integral/Makefile

...st/crystallization/rt-spherical-integral/colvar.reference

regtest/crystallization/rt-spherical-integral/config

...st/crystallization/rt-spherical-integral/forces.reference

regtest/crystallization/rt-spherical-integral/plumed.dat

regtest/crystallization/rt-spherical-integral/trajectory.xyz

src/analysis/Histogram.cpp

src/bias/MetaD.cpp

src/core/PlumedMain.cpp

src/crystallization/BondOrientation.cpp