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When trying to do it with -D we were having trouble getting the double
quotes through in all Windows configurations.

Use Chaitin's formula for calculation of spill costs.
  Cost to spill some vreg = (num writes + num reads) / degree of node

With 2 extra provisos:
  1) Don't spill vregs that live for only 1 instruction.
  2) Always prefer to spill vregs that live for a number of instructions
       more than 10 times the number of vregs in that class.

Proviso 2 is there to help deal with basic blocks containing very long
live ranges - SHA1 has live ranges > 1700 instructions. We don't ever
try to keep these long lived ranges in regs at the expense of others.

Because stack slots are allocated from a global pool, and there is no
slot coalescing yet, without this condition the allocation of SHA1 dosn't
converge fast enough and eventually runs out of stack slots.

Prior to this patch we were just choosing to spill the range with the
longest lifetime, so we didn't bump into this particular problem.

default YES on Windows, NO otherwise.

When printing types for the user, the interactive UI often wants to
leave foralls implicit.  But then (as Claus points out) we need to be
careful about name capture. For example with this source program

	class C a b where
	  op :: forall a. a -> b

we were erroneously displaying the class in GHCi (with suppressed
foralls) thus:

	class C a b where
	  op :: a -> b

which is utterly wrong. 

This patch fixes the problem, removes GHC.dropForAlls (which is dangerous),
and instead supplies PprTyThing.pprTypeForUser, which does the right thing.

This helps to get pretty printing right,
nested newtypes were not being shown correctly by :print

    
    The flag enables the use of Show instances in :print.
    By default they are not used anymore

It is needed by cmm/StackColor, and hence is needed even when there is no
native code generator.

  -- LastBranch no longer takes parameters
  -- LastJump and LastReturn no longer carry CmmActuals;
     instead, those are carried by a CopyOut in the same basic block

We now set the flags once and for all in compiler/Makefile.

OK, so the name is a bit wrong now...

haddock sometimes makes doc-index-A.html etc files. Not sure why it
doesn't for me.
Patch from Judah Jacobson.

On Windows we now always use a path beginning $topdir/ so bindists are
relocatable.

We also now tell "Setup configure" where we are putting the
documentation, and tell installPackage to override as little as
possible.