New Plan9 port

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+=head1 NAME
+
+perlplan9 - Plan 9-specific documentation for Perl
+
+=head1 DESCRIPTION
+
+These are a few notes describing features peculiar to
+Plan 9 Perl. As such, it is not intended to be a replacement
+for the rest of the Perl 5 documentation (which is both 
+copious and excellent). If you have any questions to 
+which you can't find answers in these man pages, contact 
+Luther Huffman at lutherh@stratcom.com and we'll try to 
+answer them.
+
+=head2 Invoking Perl
+
+Perl is invoked from the command line as described in 
+L<perl>. Most perl scripts, however, do have a first line 
+such as "#!/usr/local/bin/perl". This is known as a shebang 
+(shell-bang) statement and tells the OS shell where to find 
+the perl interpreter. In Plan 9 Perl this statement should be 
+"#!/bin/perl" if you wish to be able to directly invoke the 
+script by its name.
+     Alternatively, you may invoke perl with the command "aperl"
+instead of "perl". This will produce Acme-friendly error
+messages of the form "filename:18".
+
+Some scripts, usually identified with a *.PL extension, are 
+self-configuring and are able to correctly create their own 
+shebang path from config information located in Plan 9 
+Perl. These you won't need to be worried about.
+
+=head2 What's in Plan 9 Perl
+
+Although Plan 9 Perl currently only  provides static 
+loading, it is built with a number of useful extensions. 
+These include Safe, FileHandle, Fcntl, and POSIX. Expect 
+to see others (and DynaLoading!) in the future.
+
+=head2 What's not in Plan 9 Perl
+
+As mentioned previously, dynamic loading isn't currently 
+available nor is MakeMaker. Both are high-priority items.
+
+=head2 Perl5 Functions not currently supported
+
+Some, such as C<chown> and C<umask> aren't provided 
+because the concept does not exist within Plan 9. Others,
+such as some of the socket-related functions, simply
+haven't been written yet. Many in the latter category 
+may be supported in the future.
+
+The functions not currently implemented include:
+
+    chown, chroot, dbmclose, dbmopen, getsockopt, 
+    setsockopt, recvmsg, sendmsg, getnetbyname, 
+    getnetbyaddr, getnetent, getprotoent, getservent, 
+    sethostent, setnetent, setprotoent, setservent, 
+    endservent, endnetent, endprotoent, umask
+
+There may be several other functions that have undefined 
+behavior so this list shouldn't be considered complete.
+
+=head2 Signals
+
+For compatibility with perl scripts written for the Unix 
+environment, Plan 9 Perl uses the POSIX signal emulation
+provided in Plan 9's ANSI POSIX Environment (APE). Signal stacking
+isn't supported. The signals provided are:
+
+    SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT,
+    SIGFPE, SIGKILL, SIGSEGV, SIGPIPE, SIGPIPE, SIGALRM, 
+    SIGTERM, SIGUSR1, SIGUSR2, SIGCHLD, SIGCONT,
+    SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU
+
+=head1 BUGS
+
+"As many as there are grains of sand on all the beaches of the 
+world . . ." - Carl Sagan
+
+=head1 Revision date
+
+This document was revised 04-July-1996 for Perl 5.003_1.
+
+=head1 AUTHOR
+
+Luther Huffman,    lutherh@stratcom.com
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