mu4e: add mu4e-headers-split-view-shrink
mu4e: add mu4e-scroll-{up,down}, use {beginning,end}-of-buffer
* mu-msg-iter: add basic implemenation of checking for msgid dups, msg file
  existence
* mu-query: update for mu-msg-iter updates
* cosmetic
* mu-msg-iter.{cc,h}: make flag names a bit clearer
* add query flags (which match msgiterflags) to mu_query_run, update callers
* add --skip-msgid-dups / -u option to mu find, document it
* fix `mu4e~headers-human-date'
* add support for searching the mailing list of a message
* cosmetics
* configure: bump version to v5
* add basic support for skipping dups, unreadable messages in mu-msg-iter
* add skipping support to mu-find
* add skipping-dups support to mu4e
* mug-msg-list-view: update for api changes
* mu4e: add support for display mailing list (short)names in headers/view mode
mu-sexp-convert: fix intra-array separator

It is now ", " rather than " ".
* mu4e-utils: when completing a maildir, put the initial / there already
* cosmetic