Changed the 'type' option in the Channel definition to 'streamtype'
     'type' is the ChannelType (network, file, ...)
     'streamtype' is an option for network channel specifying multicast/unicast

. vls.cfg: updated for parameter streamtype

. admin.cpp manger.cpp: modification in the answer for 'show' command.
  optional arguments are now shown only if they were set by the user.