This patch removes the following unused typedefs from c.h:
bool8, bool16, bool32, word8, word16, word32, Offset
In order to remove "Offset" I had to update some code in
page/bufpage.c, but that shouldn't have been using Offset to begin
with, AFAICS.
Unless anyone complains, I'll apply this in 24 hours or so.
-Neil
