Merge branch 'v2.0'

CHANGES/v2.0.txt

@@ -106,6 +106,7 @@ See <a href="http://github.com/plumed/plumed2/tree/v2.0">branch v2.0 on git repo
 
 For users:
 - Now compiles on Blue Gene Q with IBM compilers.
+- Fixed bug in \ref CENTER where default WEIGHTS were missing. 
 - Several small fixes in documentation and log file.
 
 For developers:

src/vatom/Center.cpp

@@ -90,6 +90,10 @@ Center::Center(const ActionOptions&ao):
   parseAtomList("ATOMS",atoms);
   if(atoms.size()==0) error("at least one atom should be specified");
   parseVector("WEIGHTS",weights);
+  if( weights.size()==0) {
+    weights.resize( atoms.size() );
+    for(unsigned i=0;i<atoms.size();i++) weights[i] = 1.;
+  }
   parseFlag("MASS",weight_mass);
   checkRead();
   log.printf("  of atoms");