More work on the CLI

doc/1_ctaCLI_Admin_Interface.txt

-2. CTA – Admin INTERFACE version 3.0 (03/02/2016)
+2. CTA – Admin INTERFACE version 4.0 (12/02/2016)
 
 cta bs/bootstrap --uid/-u <uid> --gid/-g <gid> --hostname/-h <host_name> --comment/-m <"comment"> // restricted usage (to be defined)
 
 cta ad/admin add/ch/rm/ls:
 	add --uid/-u <uid> --gid/-g <gid> --comment/-m <"comment">
-	ch  --uid/-u <uid> --gid/-g <gid> [--comment/-m <"comment">]
+	ch  --uid/-u <uid> --gid/-g <gid> --comment/-m <"comment">
 	rm  --uid/-u <uid> --gid/-g <gid>
 	ls
 
 cta ah/adminhost add/ch/rm/ls:
 	add --name/-n <host_name> --comment/-m <"comment">
-	ch  --name/-n <host_name> [--comment/-m <"comment">]
+	ch  --name/-n <host_name> --comment/-m <"comment">
 	rm  --name/-n <host_name>
 	ls