bundle: exclude csets given in --base, unless they are in --rev (issue1910)
Thanks Jesse Glick for the first version of this patch.
% should be empty
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
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644 a
755 * b/a
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b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 644 a
b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 755 * b/a
047b75c6d7a3ef6a2243bd0e99f94f6ea6683597 644 @ l
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% should fail
abort: unknown revision '2'!
abort: please specify just one revision
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