bug#29746: 27.0.50; emacs.appdata.xml needs to be modernized

bug#29746: 27.0.50; emacs.appdata.xml needs to be modernized

[Philipp]

The file etc/emacs.appdata.xml uses an obsolete format an now generates
Lintian errors.  See
https://lintian.debian.org/tags/appstream-metadata-legacy-format.html
and
https://www.freedesktop.org/software/appstream/docs/chap-Quickstart.html#sect-Quickstart-DesktopApps.
Output from 'appstreamcli validate is':

$ appstreamcli validate etc/emacs.appdata.xml
E - emacs.appdata.xml:~:3
    The metainfo file uses an ancient version of the AppStream specification, which 
    can not be validated. Please migrate it to version 0.6 (or higher).

Validation failed: errors: 1


In GNU Emacs 27.0.50 (build 20, x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2017-12-17 built on localhost
Repository revision: f74d811e805ebbcff9328e6cb8b5793f9d8c85ec
Windowing system distributor 'The X.Org Foundation', version 11.0.11803000
System Description: Ubuntu 14.04.5 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-gtk-deprecation-warnings --with-modules
 --without-pop --with-mailutils --enable-checking
 --enable-check-lisp-object-type --enable-gcc-warnings 'CFLAGS=-O0
 -ggdb3''

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS 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
  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

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors 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 composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray 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 94383 11339)
 (symbols 48 20127 1)
 (miscs 40 39 171)
 (strings 32 28081 1648)
 (string-bytes 1 738055)
 (vectors 16 13954)
 (vector-slots 8 491352 15308)
 (floats 8 49 68)
 (intervals 56 214 0)
 (buffers 992 12)
 (heap 1024 27894 1023))

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bug#29746: 27.0.50; emacs.appdata.xml needs to be modernized

[Glenn Morris]

Version: 26.0.91

commit c5061d8 (HEAD, origin/emacs-26, emacs-26)
Date:   Sat Dec 16 16:12:18 2017 -0800

    * etc/emacs.appdata.xml: Update file format.


appstreamcli validate etc/emacs.appdata.xml 
Validation was successful: pedantic: 1