changegroup: include subdirectory manifests in verbose size When verbose logging is one, we report the size in bytes of the manifest data in the changegroup. For files, we report the size per file, but I'm not sure we need that level of detail (i.e. size per directory manifest). Instead, report a single figure for the size of root manifest plus submanifests.

changegroup: make _packmanifests() dumber The next few patches will rewrite the manifest generation code to work with merges. We will then walk dirlogs recursively. This prepares for that by moving much of the treemanifest code out of _packmanifests() and into generatemanifests(). For this to work, it also adds _manifestsdone() method that returns the "end of manifests" close chunk for cg3 and an empty string for cg1 and cg2.

changegroup: extract generatemanifests() The changegroup.generate() function is pretty long, so let's extract the manifest generation part of it.