Merge remote-tracking branch 'origin/master'

CHANGES/Unreleased.txt

@@ -27,5 +27,7 @@ Changes from version 2.0 which are relevant for developers:
 - Improved class Communicator. Many operations can now be done directly on Vectors, Tensors, std::vector and PLMD::Matrix.
 - Patches for GPL codes (QuantumEspresso and Gromacs) now also include
   original code so as to simplify their modification.
+- Fixed dependencies among actions such that it is now possible (and reliable)
+  to use MPI calls inside Action::prepare()
 
 */

src/core/Action.cpp

@@ -121,7 +121,7 @@ void Action::parseFlag(const std::string&key,bool & t){
 }
 
 void Action::addDependency(Action*action){
-  after.insert(action);
+  after.push_back(action);
 }
 
 void Action::activate(){

src/core/Action.h

@@ -72,7 +72,7 @@ class Action
   std::vector<std::string> line;
 
 public:
-  typedef std::set<Action*> Dependencies;
+  typedef std::vector<Action*> Dependencies;
 
 private:
 /// Actions on which this Action depends.