* Add Kevin Lahey's power-saving support from the old 802.11 layer
* Support for frequency-hopping PHYs
* Add support frequency-hopping PHY mode, IFM_IEEE80211_FH
* Add channel flags for frequency-hopping
* Add mode<->media mappings in for FH PHY in ieee80211_media2rate
and ieee80211_rate2media
* Stop using IFM_MAKEMODE macro since the mode constants
(e.g., IFM_IEEE80211_11A) are pre-shifted in sys/net/if_media.h
* Add some PLCP constants.