Merge branch 'v2.3' into v2.4

CHANGES/v2.3.md

@@ -250,9 +250,16 @@ For developers:
 
 ## Version 2.3.7 (Oct 5, 2018)
 
-\plumednotmaintained
-
 For users:
 - Fixed flag DETAILED_TIMERS in \ref DEBUG (flag was ignored and detailed timers always written).
 - Small fix in \ref DUMPMASSCHARGE (atoms are now correctly requested only at first step).
 
+## Version 2.3.8 ()
+
+\plumednotmaintained
+
+For users:
+- Fixed some openMP regression (some related to the whole codes and some specifics for Coordination and Multicolvar), this were compiler dependent so not all users may have experienced them
+- Fixed an issue with \ref CS2BACKBONE when more than 2 chains were used
+
+*/