Update aliceml to use git version of Alice ML

This allows 64 bit builds of Alice ML and removes the need for old
versions of gcc to build.

The license is changed to 'mit' from the 'bsd' that it was previously
as the COPYING files in the alice and seam repositories appear to be
the modern style MIT variant (also known as the ICU variant).

Added myself as the maintainer.
new package: xwayland
update weston: add xwayland support
pythonPackages: add fig
Packaged cloud-init and its dependencies
Added the cloud-init service
eduke32.nix: disable libpng (can't build with it)
nixos: configure samba and rsync shares with sets
Skip nonreproducible Util test in paramiko
Add paramiko test removal comment
qemu: 2.0.0 -> 2.2.0

Additionally, add support for more external features as well as more
sound system types.
Add mimms, an mms (e.g. mms://) stream downloader
Erlang bump from 17.3 to 17.4 as 17.3 has a serious ssl bug
Remove mimms name from description
Add the gtk2fontsel Font Viewer
profile-sync-daemon: refactor module
libreoffice: fix Exec= in .desktop files

Before we do substitutions, the Exec= line is (currently)
"Exec=libreofficedev4.3 --some-arg". Our substitution logic doesn't handle
that, resulting in broken "Exec=$out/bin/sofficedev4.3 --some-arg"
($out/bin/sofficedev4.3 doesn't exist).

Looking at libreoffice source, the .desktop files refer to a UNIXBASISROOTNAME
variable which come from instsetoo_native/util/openoffice.lst.in. Currently, it
can have one of two values, presumably depending on whether the build is
"normal" or "development":

  libreoffice${major}.${minor}

  libreofficedev${major}.${minor}

Handle both these cases, and also leave the old non-versioned substitution
around, just in case.

Fixes issue #3463.
python: 2.7.8 -> 2.7.9

(cherry picked from commit 1f059cd5a91fee7d4ec50c7272bca5bc6733f245)
Signed-off-by: Domen Kožar <domen@dev.si>
libsepol: fix download url

(cherry picked from commit 24cba87e7f8247eb4e68ad8c850c1b404a277f13)
Signed-off-by: Domen Kožar <domen@dev.si>
nix-exec: use nix stable