Add upload from firmware tarball, gussie up command parser, add dire warnings.

Command parser now enforces little things like mutually-exclusive
required options so we warn users who attempt something silly.

Preferred source for uploads is now the firmware tarball installed
along with the client software; we still support uploading from an
explictly-specified source file, but one must now say "-i file".

Updating the bootloader is dangerous, we now say so and also require
an additional option before we'll even attempt it.  For the record,
while testing this I did manage to brick my Alpha and had to use an
ST-LINK to recover, exactly as predicted by the new dire warning.

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