added DetectAdapters() method, that returns all device information for detected adapters, not just the com port
rpi: register callback for HPD. re-read the physical address when we received VC_HDMI_ATTACHED. issue #109
Revert "rpi: don't try to release the logical address (and fail). fix verified by the logs in https://github.com/Pulse-Eight/libcec/issues/111#issuecomment-12728216" and  "rpi: don't wait for a response (and fail) when opening a connection. issue #109"
This reverts commits ab2ab9ee1ac85713acdd5c29f1c35a5992fae214 and 644b3ecf926e3745d9119ace2acc971e94e2925a.