pqm-submit public location problems

[Aaron Bentley]

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Hi all,

pqm-submit seems a bit too aggressive in seeking out public locations.

In particular, it falls back to using the parent location.  But since
the branch may be diverged from the parent location, this is frequently
a bad choice.

pqm-submit will also try to use the push location as a public location,
but this is a bad idea because most push locations require authentication.

So I'd like to change it to use
1. user option
2. public_repository configuration
3. the supplied location, if the protocol is not file://

Aaron
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