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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.

(rather than talking about tweaking the Makefile(-vars) by hand)

Merge
    ExpressionSignaturesUnboxedTuples
    TypeSynonymUnboxedTuples
into
    UnboxedTuples

With this patch, ghci runs rtti (bounded in the term treewith a max. depth of 10)
automatically after evaluating any expression in the interactive env.
In addition, a rtti step is performed on the local bindings in a breakpoint,
before returning control to the user

Let's see how well this works in practice

Previously the behaviour was to panic.
Now it will print an approximated representation, 
using the names (enclosed in keys, i.e. "<...>") 
and the pointed subterms. Non pointed subterms cannot 
be included in this representation:

Prelude> let se = Data.Sequence.fromList (map Just "abc")
Prelude> :eval se
()
Prelude> :p se
se = <Data.Sequence.Deep> (<Data.Sequence.One> (_t1::t)) () (<Data.Sequence.Two> (_t2::t) (_t3::t))
Prelude> :eval _t2
()
Prelude> :p se
se = <Data.Sequence.Deep> (<Data.Sequence.One> (_t4::t1)) () (<Data.Sequence.Two> (Just 'b') (_t5::t1))
Prelude>

This patch also includes some fixes in the pretty printer 
for the Term datatype

This does a better job of showing that obtainTerm does not alter the Session

to avoid looping when reconstructing insufficiently evaluated, circular structures

In hscFileCheck, initialize md_vect_info with noVectInfo instead of
a panic value, since this is a strict field.