Merge branch 'v2.3' into v2.4

CHANGES/v2.3.md

@@ -235,6 +235,8 @@ For users:
 - GROMACS patch updated to gromacs-2016.5.
 - `./configure` crashes if prefix is set to present working directory (notice that this choice was already leading to issues).
 - \ref DUMPATOMS reports an error when trying to write xtc/xdr files without the xdrfile library installed.
+- Fixed a bug appearing when using \ref PATH or \ref GPROPERTYMAP with virtual atoms without simultaneously using the same
+  atoms in a different action.
 
 For developers:
 - Fixed small issue in debug options of \ref driver (see \issue{245}).