Merge branch 'v2.3'

CHANGES/v2.3.txt

@@ -155,7 +155,7 @@ See branch \branch{v2.3} on git repository.
 - Fixed bug in if condition in \ref PCAVARS so that you can run with only one eigenvector defined in input 
 - Fixed bug with timers in \ref sum_hills \issue{194}.
 - Fixed bug when using \ref MOVINGRESTRAINT with periodic variables such as \ref TORSION \issue{225}.
-- Fixed bug in \ref HBONDS that used to apear when you used DONORNS and ACCEPTORS with same numbers of atoms 
+- Fixed bug in \ref HBOND_MATRIX that used to apear when you used DONORS and ACCEPTORS with same numbers of atoms 
 - Fixed bug in \ref DISTANCES that appears when using BETWEEN and link cells.
 - Prevented users from causing segfaults by storing derivatives without LOWMEM flag.  In these caess PLUMED crashes with meaningful errors.
 - Fixed bug in \ref HISTOGRAM that causes nans when using KERNEL=DISCRETE option

src/analysis/PCA.cpp

@@ -79,7 +79,7 @@ the current value of the instantaneous bias (see \ref REWEIGHT_BIAS).
 d1: DISTANCE ATOMS=1,2
 d2: DISTANCE ATOMS=1,3
 d3: DISTANCE ATOMS=1,4
-d4: DISTNACE ATOMS=2,3
+d4: DISTANCE ATOMS=2,3
 d5: DISTANCE ATOMS=2,4
 d6: DISTANCE ATOMS=3,4