belfast: more fixes

user-doc/tutorials/belfast-4.txt

@@ -425,7 +425,7 @@ can be mixed and it is not necessary to keep track of which restraint was used t
 every single frame. Let's get the concatenated trajectory
 
 \verbatim
-trjcat -cat -f traj*.xtc -o alltraj.xtc
+gmx_mpi trjcat -cat -f traj*.xtc -o alltraj.xtc
 \endverbatim
 
 Now we should compute the value of each of the bias potentials on the entire (concatenated) trajectory

user-doc/tutorials/belfast-7.txt

@@ -177,7 +177,7 @@ so there seems not to be any problem on this side.
 We can use the second file to reconstruct the continuous trajectories of each replica in temperature:
 
 \verbatim
-trjcat_mpi -f traj0.trr traj1.trr -demux replica_index.xvg
+gmx_mpi trjcat -f traj0.trr traj1.trr -demux replica_index.xvg
 \endverbatim
 
 and the following PLUMED input file (plumed_demux.dat) to recalculate the value of the CVs on the demuxed trajectories,