[MERGE] Make lp-open work in more circumstances

[Jonathan Lange]

Hello,

After receiving a couple of blug reports[1], I've fixed lp-open to do
two more things:
  1. Fallback to push location if the public location is not set (bug 332372)
  2. Try to resolve the location given on the command line to a
Launchpad web page (bug 332705)

Getting this right involved tweaking the error cases somewhat.

Let me know what you think.

jml
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