[type1] restore earlier version of ``luaotfload-loaders.lua``

Hans kindly added AFM support to the merged package so we don’t need to
integrate it ourselves any longer. However, this concerns only support
for basic loading. For this reason we continue loading our imported
version of the font feature definitions
(``fonts.handlers.afm.helpdata``) in ``font-afk.lua``.
[fontloader] sync with Context as of 2013-08-25
[type1] extinguish luaotfload-font-afm.lua
[fontloader] sync luatex-basics-gen.lua
[doc] update references to AFM  loaders
[meta] exclude removed font-afm.lua from status file
[doc] upate description of contents of merged package in file graph