wireproto: rename argument to groupchunks() groupchunks() is a generic "turn a file object into a generator" function. It isn't limited to changegroups. Rename the argument and update the docstring to reflect this.

tests: actually test non-generaldelta variant for stream clones 608cabec1b15 accidentally made both tests test generaldelta repos. Restore the test for a non-gd repo.

revlog: document high frequency of code execution Recording my notes while working on performance optimization.

revlog: make code in builddelta() slightly easier to read self.compress() is destructured into its components. "l" is renamed to "deltalen."

templates: add built-in files() function We already support multiple primitive for listing files, which were affected by the current changeset. This patch adds files() which returns files of the current changeset matching a given pattern or fileset query via the "set:" prefix.

rebase: rebase changesets in topo order (issue5370) (BC) There are two reasons that rebase should be done this way: 1. This would make rebasing faster because it would minimize the total number of files to be checked out in the process, as it don't need to switch back and forth between branches. 2. It makes resolving conflicts easier as user has a better context. This commit changes the behavior in "Test multiple root handling" of test-rebase-obsolete.t. It is an expected change which reflects the new behavior that commits in a branch are grouped together when rebased.