First commit of MedtronicUploader to support 640g.

...ghtscout/android/dexcom/USB/SerialInputOutputManager.java

...va/com/nightscout/android/dexcom/USB/UsbSerialDriver.java

...va/com/nightscout/android/dexcom/USB/UsbSerialProber.java

app/src/main/java/com/nightscout/android/eula/Eula.java

...com/nightscout/android/medtronic/CommandSenderThread.java

...c/main/java/com/nightscout/android/medtronic/DataLog.java

...om/nightscout/android/medtronic/HistoricGetterThread.java

...com/nightscout/android/medtronic/MedtronicCGMService.java

.../com/nightscout/android/medtronic/MedtronicCNLReader.java

...com/nightscout/android/medtronic/MedtronicCNLSession.java

...om/nightscout/android/medtronic/MedtronicCalibration.java

.../com/nightscout/android/medtronic/MedtronicConstants.java

...ava/com/nightscout/android/medtronic/MedtronicReader.java

...ut/android/medtronic/message/ChannelNegotiateMessage.java

...ghtscout/android/medtronic/message/ChecksumException.java

...droid/medtronic/message/ContourNextLinkBinaryMessage.java

...out/android/medtronic/message/ContourNextLinkMessage.java

...ightscout/android/medtronic/message/MedtronicMessage.java

.../nightscout/android/medtronic/message/MessageHandler.java

...om/nightscout/android/medtronic/message/MessageUtils.java