Bugfix: configure: Really fix BSD sed syntax for libusb header search
Merge branch 'bugfix_usb_pkgcfg' into bfgminer-3.0.x
README.RPC: Correct to mention other supported devices for pgaidentify

Conflicts:
	README.RPC
README.RPC: Fix miner name

Conflicts:
	README.RPC
README: Add FAQ regarding cgminer messing up drivers
README.RPC: Remove usbstats mention