Merge branch 'v2.10'

Author: GiovanniBussi

CHANGES/v2.9.md

@@ -69,3 +69,5 @@ Changes from version 2.8 which are relevant for users:
 ## Version 2.9.4 (in progress)
   - Fixed an issue that might lead to a crash when using multicolvars implemented with linked cells and no PBCs, apparently
     only showing up with Intel Mac. See \issue{1181}.
+  - Small fixes to documentation.
+  - Code reformatting, to maintain mergeability with v2.10, see \issue{1157}.