tests: histedit-helpers fixbundle should not complain about no input

tests: relax histedit issue4251 and issue3893 backups I'm globbing these because some are globbed, and this pair gets in the way of the main parts of the series.

setup.py: use bytes literals The b() helper was needed because Python < 2.6 didn't support bytes literals (b''). Now that we don't support Python < 2.6, we no longer need this helper.

clonebundles: fix typo

merge: rework manifestmerge to use a matcher This opens the door to working slightly more closely with the manifest type and letting it optimize out some of the diff comparisons for us, and also makes life significantly easier for narrowhg.

merge: restate calculateupdates in terms of a matcher Once we get a matcher down into manifestmerge, we can make narrowhg work more easily and potentially let manifest.match().diff() do less work in manifestmerge.

merge: have merge.update use a matcher instead of partial fn This is relatively rarely used functionality, but migrating this to a matcher will make future work on narrow clones more feasible.

treemanifest: don't iterate entire matching submanifests on match() Before 2773540c3650 (match: remove unnecessary optimization where visitdir() returns 'all', 2015-05-06), match.visitdir() used to return the special value 'all' to indicate that it was known that all subdirectories would also be included in the match. The purpose for that value was to avoid calling the matcher on all the paths. It turned out that calling the matcher was not a problem, so the special return value was removed and the code was simplified. However, if we use the same special value for not just avoiding calling the matcher on each file, but to avoid iterating over each file, it's a much bigger win. On commands like hg st --rev .^ --rev . dom/ we run the matcher (dom/) on the two manifests, then diff the narrowed manifest. If the size of the match is much larger than the size of the diff, this is wasteful. In the above case, we would end up iterating over the 15k-or-so files in dom/ for each of the manifests, only to later discover that they are mostly the same. This means that runningt the command above is usually slower than getting the status for the entire repo, because that code avoids calling treemanifest.match() and only calls treemanifest.diff(), which loads only what's needed for the diff. Let's fix this by reintroducing the 'all' value in match.visitdir() and making treemanifest.match() return a lazy copy of the manifest from dom/ and down (in the above case). This speeds up the above command on the Firefox repo from 0.357s to 0.137s (best of 5). The wider the match, the bigger the speedup.

pathencode: remove an unused assignment

parsers: narrow scope of a variable to be less confusing