Plumedbot commit: headers

This commit contains changes automatically generated by plumedbot on Travis-ci.

src/colvar/DRMSD.cpp

 /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-   Copyright (c) 2012-2017 The plumed team
+   Copyright (c) 2012-2018 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/colvar/ERMSD.cpp

 /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-   Copyright (c) 2016,2017 The plumed team
+   Copyright (c) 2016-2018 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.