Document Host/Session Usage

[nthallen]

This belongs both in doxygen and in the Wiki.

• Need to make distinction between Client usage and server usage.
• Summarize the currently defined function groups and what they apply to
• Document oui conventions to include relevant function information in usage message

[nthallen]

-H function:host

• If host is '-', deletes the host entry (the default) for this function
• if function is '', defines a default hostname for all functions

-S function:session

• If session is '-', deletes the session definition if it exists
• If function is '', defines a default session for all functions

This information could be added to the help text for host_session.oui

Applications should document the functions they define in their oui definitions:

<unsort>
Host_Session function memo: Where messages are sent

[nthallen]

An application can define a default host for a function by specifying:

hs_registry::add_host(func, def_host);

This needs to happen either before calling oui_init_options(). It could also be done in an .oui file, but care would need to be taken to ensure the default is specified before any command line options (hence the preference for doing it before calling oui_init_options()).