Operations on this branch don't work otherwise.
Reading branches.cache had to be adjusted to allow an empty label.
Adjusted reading of the cache tip for symmetry, no functional change here.
Some systems show "Thu Jan 01" instead of "Thu Jan 1", which breaks tests.
Using "1000000" yields "Mon Jan 12 13:46:40 1970", which looks the same on
all systems.
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Hash: SHA1
Fix dodiff/changes
dodiff was failing to pass both nodes to changes
changes was comparing things backwards, resulting in added/deleted confusion
in dodiff
changes was deleting things from cached manifests, use copy()
changes now sorts output lists
manifest hash: 6ad972b0895b9d855e246efef49c2ebd943946b3
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Hash: SHA1
Refactor diffrevs/diffdir into changes
Add dirstate.changes to replace most of diffdir
Add localrepository.changes to replace diffrevs/diffdir
This code can now efficiently check for changes in single files, and
often without consulting the manifest. This should eventually make 'hg
diff Makefile' in a large project much faster.
This also fixes a bug where 'hg diff -r tip' failed to account for
files that had been added but not committed yet.
manifest hash: 20fde5d4b4cee49a76bcfe50f2dacf58b1f2258b
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