[MERGE] Remove specialized has_revisions() implementation.

[Jelmer Vernooij]

The attached patch removes an unnecessary implementation of
has_revisions() in the pack repository code. The generic
implementation works just as well and does ask fallback repositories.

This is necessary to allow bzr-svn to create stacked branches (which I
can now successfully create, although they're quite slow at the moment).

Cheers,

Jelmer

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