The Bayonne Telephony "Shell" is meant to be used in writing bash
(/bin/sh) admin scripts that can include commands to control the
resident Bayonne server.  The #! start line can be set to use "bts", as
in #!/usr/local/bin/bts, and one can then create shell scripts for
cron-jobs and other purposes that directly control your bayonne server.

The "bts" shell loads a bunch of properties for the currently running
server into the env space.  These can then be accessed by your shell
script.  The "bts" shell also redirects the PATH to a place where a
bunch of special shell commands to represent Bayonne "fifo" commands
exist.  These can be used in your script to pass commands to bayonne,
and to retrieve results, such as for use in sh "if" statements.

The "btstool" supplies a shell level interface to the running server.  
It is mostly used to inject Bayonne specific "bts" shell commands which
exist as a symlink to btstool itself.  "btstool" knows when to encode
arguments as url-escaped, and other things for common fifo commands.

