Add rule to unpack 1BSD archive

The contents of the directories are in "old PDP-11 archive" format
(0177545), so further unpacking is needed.
Clarify current goal
Remove carriage-returns
Clarify how first timeline will be followed
Program read read old PDP-11 archives

Obtained from: ftp://ftp.tuhs.org.ua/PDP-11/Tools/Tapes/newoldar.c

README file:

newoldar							21 May 2000

Description:

A modified 2.9BSD ar which handles archives created on a PDP-11 directly from
non-PDP platforms.  Archives identified as "old PDP-11 archive" by file(1)
or otherwise having a 2-byte header of value 177545 (0xff65) can be
manipulated using this utility.  The omnipresent "cont.a" archives
fall into this category.

Usage: newoldar [opt] archive

See ar(1) for extended options and better documentation.
Of interest to most users are t|x - test archive or extract.

Tested under: 	FreeBSD/i386 and OpenBSD/i386
with: 		1BSD source distribution and Shoppa's Usenix tapes.

This quick hack brought to you by:
Brandon Creighton

Submitted by (didn't debug fast enough):
Dan Frasnelli
[dfrasnel@corewar.com]
Add rule for building newoldar
Add support for -o flag, which maintains file time
Silence compiler warnings
Add 3rd Edition retrieval rule
Add 4th Edition rule
Refactor archive fetching
Ignore newoldar executables