[jhc] darcs patch: add 'capi' foreign function call type, s... (and 3 more)

Thu Feb 9 01:16:11 PST 2012 John Meacham * add 'capi' foreign function call type, simplify type of E.FromHs monad, check for more FFI related errors Thu Feb 9 02:07:04 PST 2012 John Meacham * turn ExtType into a real abstract type Thu Feb 9 02:49:20 PST 2012 John Meacham * remove APrim type, use Prim directly, clean up corresponding cruft. Thu Feb 9 03:42:21 PST 2012 John Meacham * fix obscure error message for invalid instance reported by roman