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so that exceptions are reported with "*** Exception" instead of as a panic.

Adopt the suggestion of Trac #2993, and tidy up the reporting of
precedence parsing errors somewhat.

This patch is a straightforward extension of the 'deriving' mechanism.
The ability to derive classes Functor, Foldable, Traverable is controlled
by a single flag  -XDeriveFunctor.  (Maybe that's a poor name.)

Still to come: documentation

Thanks to twanvl for developing the patch

We get caught by
    http://savannah.gnu.org/bugs/index.php?1516
    $(eval ...) inside conditionals causes errors
with make 3.80, so warn the user if it looks like they're about to
try to use it.

The Note [Recursive instances and superclases] explains the subtle
issues to do with generating the bindings for superclasses when
we compile an instance declaration, at least if we want to do the
clever "recursive superclass" idea from the SYB3 paper.

The old implementation of tcSimplifySuperClasses stumbled when
type equalities entered the picture (details in the Note); this
patch fixes the problem using a slightly hacky trick.  When we
re-engineer the constraint solver we'll want to keep an eye on 
this.

Probably worth merging to the 6.10 branch.

Ensuring that 
  a) lambdas show up only on the RHSs of binding after CorePrep
  b) the arity of a binding exactly matches the maifest lambdas
is surprisingly tricky.

I got it wrong (again) in my recent CorePrep shuffling, which broke
packages HTTP and DPH.  This patch fixes both.

They are GFDLed, which causes problems for Debian

The problem is that we install the client's CWD before calling
runStmt, but runStmt has to load modules before running the code.  We
need to install the CWD just before running the code instead, which
means it has to be done inside runStmt (and resume).

From #2951

In this version, I untag R1 before using it, and even enter R2 at the
end rather than simply returning it (which didn't work right when R2
was a thunk).

A real bug in the x86_64 native code gen: nice!

This bug would have been caught by -Wall, and I would have gone though
and Walled this file but I know Ben is hacking on this file quite
heavily and I don't want to create undue conflicts.  Ben: it would be
nice to enable -Wall here when you have time.

Solaris's patch can't apply them if the lines beginning "---" aren't
preceeded by a "diff -ur foo bar" line.

Fixes trac #2956

 * Fix loading of 64bit floats
 * Put SRT and other read only static data in the .text segment

  * Use BlockIds in branch instructions instead of Imms.
  * Assign FP values returned from C calls to the right regs
  * Fix loading of F32s
  * Add a SPARC version of the FreeRegs map to the linear allcator.

This makes about half the tests in codeGen/should_run work.

In RTS tracing code, need to untag the pointer before trying 
to load the info table in printClosure()