Add mes and mescc-tools-extra

mescc-tools-extra contains two important tools:
- cp
- chmod

mes first builds itself from a mes 0.21 seed as used by guix, and then
builds a mes 0.22 and then mes 0.22 using that created mes 0.22.

It does /not/ use bootstrap.sh as we don't have a proper shell at this
point, it has been manually adapted for kaem.

sysa/mes-0.22/doc/announce/ANNOUNCE-0.13

@@ -0,0 +1,81 @@
+Subject: Mes 0.13 released
+
+I am pleased to announce the release of Mes 0.13, representing 45
+commits over 3 weeks.  MesCC can now compile a functional tcc when
+running on Mes (in ~1h45') or on Guile (in ~3min).
+
+This means that we are getting very close to a full source bootstrap
+of tcc: it is now built without gcc, glibc or guile; using only
+MesCC-tools and Mes sources and corresponding ascii/binary seeds.
+
+* About
+
+    Mes[0] aims to help create full source bootstrapping for GuixSD[1]
+    as part of the bootstrappable builds[2] project.
+
+    It currently consists of a mutual self-hosting Scheme interpreter
+    prototype in C and a Nyacc-based C compiler in Scheme.  This C
+    prototype is being simplified to be transpiled by M2-Planet[3].
+
+    The Scheme interpreter prototype (mes.c) has a Garbage Collector,
+    a library of loadable Scheme modules-- notably Dominique Boucher's
+    LALR[4], pre-R6RS portable syntax-case[5] with R7RS ellipsis, Matt
+    Wette's Nyacc[6], Guile's PEG[7] --and test suite just barely
+    enough to support a simple REPL (repl.mes) and simple C-compiler
+    MesCC.
+
+    Mes+MesCC can compile a modified TinyCC[8] that is close to being
+    self-hosting.  A GNU Gcc-compiled tcc is known[9] to compile GCC.
+
+    Mes is inspired by The Maxwell Equations of Software: LISP-1.5[10]
+    -- John McCarthy page 13, GNU Guix's source/binary packaging
+    transparency and Jeremiah Orians's stage0[11] ~300 byte self-hosting
+    hex assembler.
+
+* Download
+
+    git clone https://gitlab.com/janneke/mes
+
+    wget https://gitlab.com/janneke/mes/-/archive/v0.13/mes-0.13.tar.gz
+
+Mes runs from the source tree and can also be built, packaged and
+installed in Guix[SD] by the usual
+
+    guix package -f guix.scm
+
+* Changes in 0.13 since 0.12
+ ** Core
+ *** Bootstrapped Mes+MesCC can now compile a patched tcc in ~2h30' (~25,000 LOC).
+ *** MesCC scripts for Mes and Guile are now merged; executable is: `mescc'.
+ *** Mes now uses only one arena for stop-and-copy; doubles available size.
+ *** Mes now has a Guile-like command-line interface (mes.repl has been removed).
+ *** Mes now boots into a full Scheme by default.
+ *** Mes can now be compiled (MES_MINI=1) to boot into a minimal Scheme (~2000 cells).
+ *** Mes now creates less garbage in the reader and in
+ append2, append_reverse, reverse, reverse!, vector-for-each, vector-to-list, vector-map.
+ *** 5 new functions
+ append-reverse, chmod, ioctl, isatty, isspace, last_pair, reverse!.
+ ** Language
+ *** 3 new functions
+ char-whitespace?, chmod, isatty?
+ ** Noteworthy bug fixes
+ *** Two bugs in the jam scraper/garbage collector have been fixed.
+ *** equal2_p now uses tail call elimination.
+ *** Escaped characters in strings are now read and write'd correctly.
+ *** The repl now expands macros again.
+
+Greetings,
+janneke
+
+[0] https://gitlab.com/janneke/mes
+[1] https://www.gnu.org/software/guix
+[2] http://bootstrappable.org
+[3] https://github.com/oriansj/m2-planet
+[4] https://github.com/schemeway/lalr-scm
+[5] https://www.cs.indiana.edu/chezscheme/syntax-case/old-psyntax.html
+[6] https://www.nongnu.org/nyacc/
+[7] https://www.gnu.org/software/guile/docs/master/guile.html/PEG-Parsing.html
+[8] https://gitlab.com/janneke/tinycc
+[9] https://lists.gnu.org/archive/html/tinycc-devel/2017-05/msg00103.html
+[10] http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
+[11] https://github.com/oriansj/stage0