SynChan message setup incorrectly if added after Readcell
Created by: subhacom
If a cell is created using ReadCell, then the compartment-synchan message does not get added properly. Along with the usual channel message, another axial message also gets added between the two.
This will happen irrespective of whether the synchan is created using readcell, or via the shell.
File: Synchan.g in TESTS/bugs/synmsg
Reported by: niraj_