* mu4e.texi: some updates to the docs
* mu-find: add the summary-len option
* small cleanups (macos)
* update mu-index manpage (remove the outdate exit codes)
* mu4e: update the list of known mailing-lists
* better error message for some broken queries
* mu-date: small optimization
* update mu_date_str_to_time_t for macos

  at macos this function /seemed/ to massively leak, when looking at the
  valgrind output on macos (but not linux). with this update, this
  leak(?) is gone.
* fix the mu_util_fputs_encoded/bsd heisenbug

  it seems g_locale_from_utf8 behaves a bit differently on bsd/macosx,
  causing a segfault (but when run under gdb!). this code path was hit
  for messages with encoding problems in non-utf8 locales
* update gitignore