Solution for baz2bzr revision ids on windows

[Aaron Bentley]

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John Arbash Meinel wrote:
> I have a somewhat pressing need to have the revision-id problem solved.

> If I have to, I'll just hack baz2bzr to use # instead of : or somesuch.
> (I can use Arch-2# instead of Arch-1: if preferred)
> 
> This page has the forbidden list:
> http://www.grouplogic.com/Knowledge/index.cfm?fuseaction=view&docID=111
> / ? < > \ : * | " ^
> 
> ^ is only illegal on FAT

Okay, I think we should make this Arch-2.  It's going to hurt anyhow, so
we might as well pull the bandaid off quickly.  Since all we're changing
is the namespace, I'd like an option to generate Arch-1 style revision-ids.

I would like to avoid this situation in the future, so I think we should
make all ids escaped utf8-encoded strings that cannot include any
forbidden characters.

This would permit using any character as the namespace separator, but
for the sake of aesthetics, I think we should use a different character.
 Semicolon and comma are my leading candidates.

If we use URL escaping, we should also change the Arch path separator,
since % would be %25.  If it's going to be escaped anyhow, we should use
%2f.  Otherwise, suggestions for an alternate character are welcome.

Do you have the time to do this work?

Aaron
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