strhelper_lan::get_idf_info

Source: stream/helpers/lan/strhelper_lan__get_idf_info.pro

 strhelper_lan::get_idf_info
        Return some or all of the IDF info on a data stream.

 Usage:
        info = strref -> get_idf_info(<keys>)

 Keywords:
        name            Get the channel name
        description     Get a description of the channel
        energy          Get the mid-point energy
        erange          Get the minimum & maximum energy
        geometry        Get the geometry factor.
        sectors         Get the number of sectors available.
        duty            Get the nominal duty cycle.
        location        Get the location in the record.
        cadence         Get the cadence of the channel
        mgroup          Get the "mgroup" of the channel

 Notes:
        If no keys are given, then the whole IDF info structure is
        returned. The keys have the priorty as above. Background,
        being independently settable has its own get as well.

 History:
        Original: 20/12/99; SJT
        Moved to strhelper_lan class: 21/12/99; SJT
        Add cadence: 1/2/00; SJT
        Modify energy unit handling: 24/3/00; SJT
        Add mgroup key: 14/7/00; SJT
        Added _extra key to swallow unused items: 24/7/01; SJT