subrepo: return only the manifest keys from hgsubrepo.files() This is in line with the other subrepo classes (i.e. only the filenames are returned). Archive iterates over the manifest keys, and since subrepo archive() uses this method, it does too now. This will allow largefiles to override its manifest keys to present the largefiles instead of the standins. Once in place, we shouldn't need the copy/paste overrides of archive and subrepo archive in largefiles, that don't quite behave like the core methods they are overriding.

archive: change the default prefix to '' from None All current callers supply some sort of prefix, so the issue was hidden. But if no parameter was specified, a crash occurred in the write() closure when concatenating 'prefix' and 'name'.

debugsetparent: document one common caveat specifically After calling debugsetparent, it's quite common that status is incorrect. The command's help text already says that it should be used with care, but let's describe this caveat explicitly since it's probably the most common one.