Added an init string for SiRF receivers that will bring them back out of the binary mode configuration that AP_GPS_Auto sets them to.
Picked up the GPS logging format from the AP_GPS_Auto test.
git-svn-id: https://arducopter.googlecode.com/svn/trunk@1469 f9c3cf11-9bcb-44bc-f272-b75c42450872
Teach AP_GPS about FastSerial (in the few places it needs to know) and about Stream everywhere else.
Do some minor code cleanup.
Tested with Mega and uBlox. Some issues (e.g. reporting 0 satelites) remain.
git-svn-id: https://arducopter.googlecode.com/svn/trunk@404 f9c3cf11-9bcb-44bc-f272-b75c42450872
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