doc: fix up confusing doc comment Differential Revision: https://phab.mercurial-scm.org/D6829

strip: fix bug with treemanifests and unordered linkrevs This is the treemanifest version of f45f7390c1c5 (strip: calculate list of extra nodes to save and pass it to changegroupsubset, 2008-01-19). Differential Revision: https://phab.mercurial-scm.org/D6795

repair: extract a helper for generating all manifest revlogs We'll need to walk the manifest revlogs also to figure out which manifests have linkrevs out of order (for fixing the bug shown in the previous patch). By the way, perhaps it would be more efficient in many cases to find only the relevant directory manifest revlogs based on the files instead of walking the entire store, but that can be changed later. Differential Revision: https://phab.mercurial-scm.org/D6794