NetSurf on ROLF

I thought it was time to update NetSurf on ROLF, so I have.

Revision 191 should build on a clean system.

Most annoying features:

• Can't type a URL into the URL bar
• Menu in a window exits the application
• Double-clicking an html file doesn't start the program [Fixed in rev. 192]
• Scroll bars don't update properly

Still, it should give an idea of what's possible.

I've done something to the filer that means the NetSurf icon shows up OK, but none of the others do, any more. [Update: That was just a libpng version mismatch, which also showed up as lots of NoMemory messages from NetSurf.]