Version Control With Subversion Source

simple clarification about plural

change some words

First part of id svn.developer and whole svn.developer.layerlib translated

aggiunta una riga

First pass completed. Need more reviews, IMHO

Some more work

Verified until "Versionamento per risorsa"

Oops. Missed 'djh' and 'nsd' in my last username purge.

Remove from COMMITTERS (and the auth system) English users who got
grandfathered commit access by virtue of having full commit access on
the Subversion repository at the time the book was split off from it,
but who've never committed to the book sources:

jimb Jim Blandy <jimb@...>
gstein Greg Stein <gstein@...>
daniel Daniel Stenberg <daniel@...>
kevin Kevin Pilch-Bisson <kevin@...>
philip Philip Martin <philip@...>
jerenkrantz Justin Erenkrantz <justin@...>
bcollins Ben Collins <bcollins@...>
epg Eric Gillespie <epg@...>
jszakmeister John Szakmeister <john@...>
dberlin Daniel Berlin <dberlin@...>

I'd trust any of these folks to tweak the book, of course, but would
prefer that we avoid spurious accounts.

Remove fa_stu and giorgio_valoti usernames, at Federico's request.