Merge branch 'topic/nyd2'

Merge branch 'topic/nyd2'

* topic/nyd2:
  urlcrecry.c: use NYD2 where applicable
  tty.c: use NYD2 where applicable
  thread.c: use NYD2 where applicable
  strings.c: use NYD2 where applicable
  popen.c: use NYD2 where applicable
  mime_cte.c: use NYD2 where applicable
  imap_cache.c: use NYD2 where applicable
  imap.c: use NYD2 where applicable
  head.c: use NYD2 where applicable
  fio.c: use NYD2 where applicable
  auxlily.c: use NYD2 where applicable
  Reduce NYD dump size, uglify output
  nailfuns: add NYD2 series (only if HAVE_NYD2)
  conf.rc,mk-conf.sh,nail.h: add WANT_NYD2, reduce NYD_CALLS_MAX