[issue1749] convert: add support for launchpad URLs

[techtonik]

New submission from techtonik <techtonik at gmail.com>:

launchpad.net uses bazaar vcs. It will be enough to pass lp:branch argument 
directly to bzr, but before that correctly separate directory name::

C:\p>hg convert lp:txopenid
assuming destination lp:txopenid-hg
initializing destination lp:txopenid-hg repository
abort: The directory name is invalid: lp:txopenid-hg

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messages: 10112
nosy: techtonik
priority: feature
status: unread
title: convert: add support for launchpad URLs

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<http://mercurial.selenic.com/bts/issue1749>
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