[texworks] ConTeXt version & calling convention

[Arthur Reutenauer]

> thanks for the help on this matter. For now (the upcoming 0.4 release),
> I've decided to keep the existing MKII configuration, but to clarify
> that it's MKII and to add the synctex switch to it by default. Some
> information about using MKIV has been added to the wiki

  This sounds very sensible to me.  I was going to advocate sticking to
Mark II for the moment, until Mark IV has completely stabilised
(presumably, one or two years from now).

	Arthur