[MERGE] Add VirtualVersionedFiles class.

[Jelmer Vernooij]

The attached patch adds a simple generic VirtualVersionedFiles class that is
currently used by bzr-svn but that I also hope to use with bzr-git.

This class implements the read-only bits of the VersionedFiles API without
using a matching file format, instead relying on specified functions to 
retrieve the full texts and parent maps.

Cheers,

Jelmer
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