from link-agent to provide dynamic link modification.  Calls
    liblocsetup::os_ifdynconfig_cmds to get a list of commands to change
    the iface config; if this function does not exist, it tries to do its
    best via ifconfig.

* tmcd/linux/liblocsetup.pm: Added support for dynamic configuration of
    ath and flex900 ifacetypes.  Also added more static support for both,
    including adhoc/monitor modes, rts threshold, etc, for ath; carrier
    threshold and rx gain for flex900 (sometimes these params really need
    to be set so our gnu radios can actually talk...).

* event/link-agent/link-agent.c: Do link up/down/modify by calling
    ifdynconfig with the event params.  Backwards compat with old
    functionality.