[merge][ping] Wait on locks

[John Arbash Meinel]

The attached patch changes bzr so that when attempting to get a
write-lock it will wait up to 1 hour, and give better information to the
user about what is going on.

It seems to have gotten favorable reviews from users, but I haven't
heard anything from Robert, Martin or Aaron.

This is a fix for both bugs #43521 and #49556. The branch is available from:
http://bzr.arbash-meinel.com/branches/bzr/0.11-working/wait-on-lock

The initial work has been sitting around since 10/14 (almost 2 weeks
now), so I'd like to put it to rest.

John
=:->
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