[0/4] Input file and srcpos rework (resend again)

[David Gibson]

Thought I'd throw this patch series out there again.  It never got
merge on the previous occasions I posted it because it conflicts with
jdl's language enhancement patches.

But the language extension stuff seems to have fallen by the wayside
for the time being, and in any case it shouldn't be that hard to
update the langauge stuff on top of these cleanups.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson