Changes

** [http://www.pragma-ade.com/general/manuals/fonts-mkiv.pdf 2016 Fonts manual, all the details] for advanced users** [http://www.pragma-ade.com/general/manuals/cont-enp.pdf#[106,{%22name%22:%22Fit%22}] 2001 reference manual] ('''!!! WARNING !!!''' TO KEEP OR NOT TO KEEP)** [http://pmrb.free.fr/contextref.pdf#[145,{%22name%22:%22Fit%22}] 2013 reference manual] never officially released, with a font chapter** [http://context.aanhet.net/svn/contextman/context-reference/en/co-fonts.pdf the 2013 font chapter] as a separate document