revlog.revision(): minor cleanup
Rename some variables, making the name more obvious (in particular "cache" was
actually two different variable.
Move code around, moving the index preloading before the deltachain computation,
without that index preloading was useless (everything was read in deltachain).
% hg init t
% hg add a
% hg commit
% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
verify failed
% hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
1 files, 1 changesets, 1 total revisions
% hg commit
commit failed
% hg diff
diff -r c1fab96507ef a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-foo
+barber
% hg status
M a
? dir/a
% hg status
dir: Permission denied
M a