perf: rearrange imports of changelong and manifest to appease check-code

merge with stable

tests: fix check-code breakage

paper: add infinite scrolling to graph by calling ajaxScrollInit at the page

hgweb: add graph mode of ajax response processing While the default mode appends all the new entries to a container on the page, the graph mode resizes canvas correctly, and repaints the graph to include newly received data.

hgweb: make infinite scroll handling more generic and extensible Namely, this allows the next page pointer to be not only revision hash given in page code, but also any value computed from the value for previous page.

hgweb: add reset javascript function to Graph It makes the Graph object to be in the same state as just after the initialization. This will help to add infinite scrolling to graph view.

largefiles: setup "largefiles" feature in each repositories individually Before this patch, if largefiles extension is enabled once in any of target repositories, commands handling multiple repositories at a time like below misunderstand that "largefiles" feature is supported also in all other local repositories: - clone/pull from or push to localhost - recursive execution in subrepo tree This patch registers "featuresetup()" into "featuresetupfuncs" of "localrepository" to support "largefiles" features only in repositories enabling largefiles extension, instead of adding "largefiles" feature to class variable "_basesupported" of "localrepository". This patch also adds checking below to the largefiles specific class derived from "localrepository": - push to localhost: whether features supported in the local(= dst) repository satisfies ones required in the remote(= src) This can prevent useless looking up in the remote repository, when supported and required features are mismatched: "push()" of "localrepository" also checks it, but it is executed after looking up in the remote.