[e4-dev] Updated e4 wiki for loading PSFs

[Kevin McGuire <Kevin_McGuire@xxxxxxxxxx>]

I've made the following updates to the
wiki:

1) On the e4 home page (wiki.eclipse.org/E4)
I've updated the "Get It" section to tell people to take M4 as
the base (since that's what the builds use) and noted to install EMF for
modelled UI work.

2) On the PSFs page (wiki.eclipse.org/E4/ProjectSetFiles
I added a section "Which PSFs Should I Load?" with a section
for e4.ui, explaing which PSFs are for what.  Perhaps others would
like to list their PSFs there.  Note I'm fine having this information
on another wiki page, I just thought the page where we tell them how to
import PSFs might be a good place to tell them which do what.

Kevin