Merge branch 'v2.3' into v2.4

src/colvar/MultiRMSD.cpp

 /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-   Copyright (c) 2014-2017 The plumed team
+   Copyright (c) 2013-2017 The plumed team
    (see the PEOPLE file at the root of the distribution for a list of names)
 
    See http://www.plumed.org for more information.

src/header.sh

@@ -33,6 +33,7 @@ then
   echo -n "Custom header for file: $file"
 else
     years=$(git log --follow -M75% --format=%aD $file |
+    sort -r -n -k 4 |
     awk '{if(NR==1)last=$4;}END{
     first=$4
     if(first=="") print ""

src/reference/MultiDomainRMSD.cpp

 /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-   Copyright (c) 2014-2017 The plumed team
+   Copyright (c) 2013-2017 The plumed team
    (see the PEOPLE file at the root of the distribution for a list of names)
 
    See http://www.plumed.org for more information.

src/reference/MultiDomainRMSD.h

 /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-   Copyright (c) 2014-2017 The plumed team
+   Copyright (c) 2013-2017 The plumed team
    (see the PEOPLE file at the root of the distribution for a list of names)
 
    See http://www.plumed.org for more information.