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This makes the code slightly simpler but only works because we do not support
rank-n types.

This tracks the corresponding change in package ndp. With this patch, we
finally can vectorise something (f x = x).

For the most part, this patch simply renames functions which had been used
for closure conversion and hence have CC in their name. It also changes the
OccNames generated by vectorisation.

Because branches might now go to continuations and become calls to 
continuations, 'allow_header_set' isn't always correct.
Removing that parameter makes the conservative approximation.
A better approximation might save one memory store is some cases.

These could occur due to GC checks.

The parser/flattener will generate an extra block after an if/else 
statement even if both branches exit the function.  So it is possible
for the input to the CPS pass to have dead/unreachable blocks.

If a dead block goes to a live block then the live block would
have more parents than the dead block and prior to this patch
the live block would then be identified as a proc point.
This is fixed by adding a check to see if the parent
has at least one owner.

It was using the return point label before; now it uses the info label.

From Pepe Iborra (mnislaih)

It was done in a bit of the Makefile that was if'ed out for Windows.

The ghci command list is now much larger than it used to be, and it
tends to go out of sync with the docs anyway.