bug#23487: 25.0.93; Modules: add functionality to create and copy unibyte strings

[Philipp Stephani <p.stephani2@gmail.com>]

Currently creating unibyte strings with the C module API is rather
convoluted: one has to create a list with the individual bytes and then
call `unibyte-string', requiring lots of memory allocations.  Given that
creating a unibyte string is more fundamental than creating a multibyte
string, I propose adding functions to create and extract unibyte strings
that exactly mirror the existing support for multibyte strings.



In GNU Emacs 25.0.93.5 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-04-24 built on localhost
Repository revision: 0cd2e923dba8d8c7128b0c084ce6af22069e8db5
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
 'configure --with-modules'

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec epg epg-config mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader cus-edit cus-start cus-load wid-edit
thingatpt smtpmail auth-source cl-seq eieio byte-opt bytecomp
byte-compile cl-extra cconv eieio-core cl-macs gv gnus-util
password-cache sendmail rfc2047 rfc2045 ietf-drums mm-util help-fns
help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr mail-utils
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset
image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 116766 9764)
 (symbols 48 22500 0)
 (miscs 40 435 169)
 (strings 32 21796 4523)
 (string-bytes 1 627075)
 (vectors 16 14860)
 (vector-slots 8 467108 5936)
 (floats 8 205 107)
 (intervals 56 258 18)
 (buffers 976 15)
 (heap 1024 47322 987))

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