Search for files in the CVS Attic
Search for files in the CVS Attic

Until now, we've been stripping "Attic" out of all CVS paths. This worked for
almost all things, except when a change included a file which was "cvs remove"d.
This change alters the CVS SCMTool to try both the attic path and the non-attic
path.

This change is a reimplementation of http://reviews.review-board.org/r/555/

Testing done: Ran scmtools unit tests.
Fixes bug 394
Reviewed at http://reviews.review-board.org/r/1084/

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