Added src/client/cmdTemplate/templateListSingle.go which I had forgotten to add previously

Previously, the VM_LIST VM capability allowed one to list the VM as well as attach to it. This capability was too coarse. Instead, VM_LIST should only allow one to list the VM and nothing more. The VM_ATTACH capability was added specifically to allow a user to attach to the VM.

modified:   README.md
modified:   docs/INSTALL.md
modified:   docs/README_client.md

---------------------
vmstartwithcreds    Starts one or more VMs with user-defined credentials.
                    Requires VM_START VM access capability or VM_START_ANY user capability.
---------------------
client: fixed ReadCSVColumn which didn't work if separator char was not a comma