Initial commit: Schunix as it stands before the SchOS rename

An x86-64 operating system built from xv6, now largely rewritten: SMP,
a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF
rasteriser, and a Linux-numbered syscall ABI.

No history before this point -- the tree was never under version control.
This commit exists so the rename that follows has something to undo to.

tools/pr.pl

@@ -0,0 +1,36 @@
+#!/usr/bin/perl
+
+use POSIX qw(strftime);
+
+if($ARGV[0] eq "-h"){
+	shift @ARGV;
+	$h = $ARGV[0];
+	shift @ARGV;
+}else{
+	$h = $ARGV[0];
+}
+
+$page = 0;
+$now = strftime "%b %e %H:%M %Y", localtime;
+
+@lines = <>;
+for($i=0; $i<@lines; $i+=50){
+	print "\n\n";
+	++$page;
+	print "$now  $h  Page $page\n";
+	print "\n\n";
+	for($j=$i; $j<@lines && $j<$i +50; $j++){
+		$lines[$j] =~ s!//DOC.*!!;
+		print $lines[$j];
+	}
+	for(; $j<$i+50; $j++){
+		print "\n";
+	}
+	$sheet = "";
+	if($lines[$i] =~ /^([0-9][0-9])[0-9][0-9] /){
+		$sheet = "Sheet $1";
+	}
+	print "\n\n";
+	print "$sheet\n";
+	print "\n\n";
+}