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Some improvements to `getty`

Jeremy Soller requested to merge goyox86:goyox86/getty-improved into master

Created by: goyox86

  • Improved error handling over all (I think 😉 ).
  • Switched to argument parsing by ArgParser.
  • Replaced panics by calls to `fail.
  • Removed unwraps ignoring results of syscalls when clearing the screen and flushing stdout.
  • Added docs for 'noclear' option.
  • The current implementation was receiving n arguments and was considering only the last one as the TTY this new one checks that we have at least one and always use the first one.
  • Added constants for columns and lines.
  • Daemon receiver a reference to stderr to setup error reporting inside there.
  • Some miscs.

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