People have been having trouble finding the toybox web page (despite being
the first google hit for "android toybox"), and want toybox --help to
mention it. I was referred to https://github.com/landley/toybox/issues/50
So add a URL to toybox --help. While I was there, make unrecognized commands
(like toybox -?) suggest "toybox --help", move the install instructions
to the FAQ page (with a second link from toybox --help), and generally
tighten up the help text. Also, "toybox -*" is no longer a synonym for --long.
Oh, and I fixed some build dependencies when Config.in changes.
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