pgscript merged to svn trunk

Guys (Mickael in particular),

I've merged the pgscript patch up with the current svn snapshot, and
also removed the support for --disable-pgscript. I've also cleaned up a
few other minor things.

I'm not done with my review, but here's the updated snapshot so others
can check it. In particular, check that I didn't break anything that
worked before :-) Thanks!

Oh - sidenote. I haven't merged up the VC++ project files yet, working
on that now, but I figured I should get the code out there already...

//Magnus