Implement the core of the command suite

Implement the core of the command suite

Implement the core of the command suite.  This includes:

 (*) Standard AFS argument parsing.

 (*) Autogeneration of parsers for commands, based on description in banner
     comments and handler function arguments.

 (*) Bash completion.

 (*) Command suite multiplexing based on argv[0] and argv[1].

 (*) "help" and "apropos" for bos, fs, pts and vos.

Each command must be preceded by a comment that conforms to the following
template:

	/***
	 * COMMAND: suite command - one-line help
	 * ARG: "-switchname"
	 * ARG: "-switchname <param-help>"
	 * ARG: "-switchname <param-help>+"
	 * ARG: [...]"
	 * ARG: ... - Auth"
	 * ARG: ... - New"
	 * NOCOMBINE: switchname, switchname
	 * NOCOMBINE: switchname, switchname
	 * NOCOMBINE: switchname, switchname
	 *
	 * multiline help
	 * multiline help
	 * multiline help
	 * multiline help
	 */

Aliases can be coded by:

	/***
	 * ALIAS: suite command - command_alias_for
	 */

Signed-off-by: David Howells <dhowells@redhat.com>