Merge repeated-slash fix

verify: tolerate repeated slashes in a converted repo (issue3665) These slashes are a hangover from issue3612, fixed in e4da793998bf. Although the bugfix in that commit is correct, the test it adds does not replicate the conditions for the bug correctly.

scmutil: generalize message to make it more i18n-friendly

update: check for missing files with --check (issue3595)

remove: don't return error on directories with tracked files Spotted by Sergey <sergemp@mail.ru>

largefiles: use 'default' instead of 'default-push' when pulling (issue3584) This only applies to downloading largefiles, and only when no source for the pull is explicitly provided. The repository itself was properly being pulled via 'default' previously. Using --all-largefiles is not necessary on a bare pull to test this (this existing test is merely a convenience), but it is required to test pulling on the rebase path. Note that the errors generated in the --rebase case are because the repo specified doesn't have the largefiles in its cache (though they are in the user cache), so the errors are misleading. Specifying --all-largefiles when cloning to 'b' fixes this, but instead of errors, it reports caching only 5 largefiles instead of the 9 that come up missing. Likely this is because the largefile download procedure tries to download missing files for each rev, and some of the files have standins in more than one rev that gets pulled.