treemanifest: implement iterentries() To make tests pass with _treeinmem manually set to True, we need to implement the recently added iterentries() on the treemanifest class too.

verify: show progress while verifying dirlogs In repos with treemanifests, the non-root-directory dirlogs often have many more total revisions than the root manifest log has. This change adds progress out to that part of 'hg verify'. Since the verification is recursive along the directory tree, we don't know how many total revisions there are at the beginning of the command, so instead we report progress in units of directories, much like we report progress for verification of files today. I'm not very happy with passing both 'storefiles' and 'progress' into the recursive calls. I tried passing in just a 'visitdir(dir)' callback, but the results did not seem better overall. I'm happy to update if anyone has better ideas.

verify: check for orphaned dirlogs We already report orphaned filelogs, i.e. revlogs for files that are not mentioned in any manifest. This change adds checking for orphaned dirlogs, i.e. revlogs that are not mentioned in any parent-directory dirlog. Note that, for fncachestore, only files mentioned in the fncache are considered, there's not check for files in .hg/store/meta that are not mentioned in the fncache. This is no different from the current situation for filelogs.