Merge branch 'sys-utils-again' of https://github.com/kerolasa/lelux-utiliteetit

Merge branch 'sys-utils-again' of https://github.com/kerolasa/lelux-utiliteetit

* 'sys-utils-again' of https://github.com/kerolasa/lelux-utiliteetit:
  cytune: fix printf type warning
  docs: mention long options in cytune.8
  cytune: coding style fixes
  cytune: refactor main(), new function query_tty_stats()
  cytune: use libc error printing facilities
  cytune: check numeric user inputs
  cytune: add long options and usage()
  docs: restructure flock.1 manual page
  flock: simplify strtotimeval()
  lib: [strutils] add strtod_or_err() function
  flock: use strutils.h to check numeric user input
  flock: use sysexit.h for all exit values
  flock: use function attributes
  flock: align with howto-usage-function.txt
  flock: use libc error printing facilities
  flock: move long_options struct to function scope
  flock: fix coding style
  docs: align fallocate.1 with howto-man-page.txt