Nowhere in the documentation does it say that the only valid package names
are ones that match (excuse my abuse of regex to explain this):
^[A-Za-z][A-Za-z0-9_]
This change makes clear the rules followed by the PackageParser
added more information to the <uses-sdk> reference,
added a link to it from the <manifes> reference, and
revised some misleading information in the android 1.1 version notes
Original author: smain
Merged from: //branches/cupcake/...
Original author: android-build
Automated import of CL 146557
