[project @ 2004-10-01 13:42:04 by simonpj]

[project @ 2004-10-01 13:42:04 by simonpj]
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	Simplify the treatment of newtypes
	Complete hi-boot file consistency checking
	------------------------------------

In the representation of types, newtypes used to have a special constructor
all to themselves, very like TyConApp, called NewTcApp.    The trouble is
that means we have to *know* when a newtype is a newtype, and in an hi-boot
context we may not -- the data type might be declared as
	data T
in the hi-boot file, but as
	newtype T = ...
in the source file.  In GHCi, which accumulates stuff from multiple compiles,
this makes a difference.

So I've nuked NewTcApp.  Newtypes are represented using TyConApps again. This
turned out to reduce the total amount of code, and simplify the Type data type,
which is all to the good.

This commit also fixes a few things in the hi-boot consistency checking
stuff.