discovery: enforce filtering into revlogbaseddag._internalizeall One more step toward discovery running on filtered repo.

discovery: make revlogdag work on filtered repo The revlogdag class is a core part of discovery. We need its initialisation to exclude revision filtered out.

pull: run findcommon incoming on unfiltered repo The discovery is not yet ready for filtered repo. Pull was using filtered for its discovery which is wrong. It worked by dumb luck because discovery mainly use funtion that does not respect the filtering. Trying to makes discovery work on filtered repo revealed this bug.

push: more robust check for bundle fast path When all changesets in the local repo are either being pushed or remotly known, we can take a fast path when bundling changeset because we are certain all local deltas are computed againts base known remotely. So we have a check to detect this situation, when we did a bare push and nothing was excluded. In a coming refactoring, the discovery will run on filtered view and the content of `outgoing.excluded` will just include unserved (secret) changeset not filtered by the repoview used to call push (usually "visible"). So we need to check if there is both no excluded changeset and nothing filtered by the current repoview.

pull: fix post-pull common computation Before that changes, pulled revision that happend to be already known locally (so, not actually added) was not taken into account when computing the new common set between local and remote. It appears that we already know the heads of the pulled set. It is in the `rheads` variable, so we are just using it and everything is works fine. We are dropping the, now useless, computation of `added` set in the process.

run-tests: better check for python version Compare version by using pythons tuple comparison. So we do not match on python 3.0 or newer.

templatekw: allow tagtypes other than global in getlatesttags hg-git uses tagtype 'git', for example, so it's better to check for tagtype != 'local', not strictly for 'global'

revlog: move file writing to a separate function Moves the code that actually writes to a file to a separate function in revlog.py. This allows extensions to intercept and use the data being written to disk. For example, an extension might want to replicate these writes elsewhere. When cloning the Mercurial repo on /dev/shm with --pull, I see about a 0.3% perf change. It goes from 28.2 to 28.3 seconds.

discovery: prefer loop to double-for list comprehension in changegroupsubset The double-for form of list comprehensions gets particularly unreadable when you throw in an 'if' condition. This expands the only remaining instance of the double-for syntax in our codebase into a loop.

merge with stable