Merge branch '2016wk15' of git://github.com/kerolasa/lelux-utiliteetit

Merge branch '2016wk15' of git://github.com/kerolasa/lelux-utiliteetit

* '2016wk15' of git://github.com/kerolasa/lelux-utiliteetit:
  mount: try to tell what mount was doing when it failed
  dmesg: --notime should not suppress --show-delta
  script: check status of writes when closing outputs
  script: avoid trying fclose(NULL)
  sulogin: make fopen O_CLOEXEC specifier usage portable
  script: close file descriptors on exec
  docs: optinal option arguments should be long-only