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Fixes Trac #6020, #6044

This has been causing bloat in the src dist for ages.

Noticed while looking at #6009, but I don't think this is the bug
(./configure always removes ghc-pwd/dist-boot before building ghc-pwd)

* Significant refactoring in tcFamPats and tcConDecl

* It seems that we have to allow KindVars (not just
  TcKindVars during kind unification.  See
  Note [Unifying kind variables] in TcUnify.

* Be consistent about zonkQuantifiedTyVars

* Split the TcType->TcType zonker (in TcMType)
   from the TcType->Type   zonker (in TcHsSyn)
  The clever parameterisation was doing my head in,
  and it's only a small function

* Remove some dead code (tcTyVarBndrsGen)

See Note [Splicing Exact names] in RnEnv.

Fixes Trac #6039, where we have a bogus kind signature
   data T (a :: j k) = MkT

Fixes Trac #5867, and is generally nicer

Modification of previous commit:
e0e99f99

Allows setting which monad GHCi runs statements in. Unsupported at this
stage.

Switched off by default. Use -favoid-vect to activate

Reduces wobble in error messages, and is better for the programmer

Fixes Trac #6020

That in turn means that you can derive Show etc in other modules,
fixing Trac #6031

It allows you to do
    (high, low) `quotRem` d
provided high < d.

Currently only has an inefficient fallback implementation.

Xcode 4.3 installs the command line tools in a different location as earlier versions of Xcode. With the bootstrapping info, the build fails if the bootstrap compiler was built with an older version of Xcode.