notion: init at 3-2015061300

The notion (not-ion) window manager [1], plus optional (defaulted to
true) Xft/pango support (via [2]). Defined a license (notion uses a
modified LGPL).

As per [3], changes:

  1. renamed option from pango -> xft, better to reflect the actual
     nature of the patch;
  2. modified the patch to replace the postPatch changes to system-autodeteck.mk;
  3. commited the patch to the nixpkgs repo;
  4. removed 'fallbackFont' as an option. Use a sensible default, instead.

Many stylistic changes, thanks to @lethalman.

[1] http://notion.sourceforge.net
[2] http://sourceforge.net/p/notion/feature-requests/47/
[3] https://github.com/NixOS/nixpkgs/pull/8789