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Short helpfile for action DUMPGRID
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The following arguments are compulsory: 

                   GRID - the action that creates the grid you would like to output 
                 STRIDE - ( default=0 ) the frequency with which the grid should be 
                          output to the file. The default value of 0 ensures that the grid 
                          is only output at the end of the trajectory 
                   FILE - ( default=density ) the file on which to write the grid. 
                REPLICA - ( default=0 ) the replica for which you would like to 
                          output this information 
                    FMT - the format that should be used to output real numbers 


