If cntlm is already running print status and exit.
h4x: Add getopt to bash.d mkscreen function.

Starting to want additional options and the static positional arguments
don't cut it anymore. This means that mkscreen now requires a -- before
any command options that are meant to be passed on. It is best to use
the format:

  mkscreen [options] -- name command args...

Existing screens have been updated to reflect this change.
Add MKSCREEN_SORT variable to activate sorting.

Caution: Not sure how thoroghly the sorting was tested (which might
explain why it was off and no option to enable it was available yet).
Add mkscreen option to simultaneously execute.

As well as an environment variable. I am considering making it the
default behavior to execute.
fixup! h4x: Add getopt to bash.d mkscreen function.
fixup! Add mkscreen option to simultaneously execute.
fixup! Add mkscreen option to simultaneously execute.
h4x: Escape git-ps1__ colors and fix device regex.

It seems in Cygwin my tty is /dev/pty1. I seem to recall having issues
on a literal virtual console with colors, but I may need to investigate
that more. Maybe I just need to identify using a tool whether the
terminal supports these color codes.
Source proxy environment if already started.