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Fixes Trac #1041

comment update

recode this file in UTF-8 from Latin-1

add LANGUAGE pragma tests

turn off orphan instance warnings

update output

Add orphan-instance warning message

Documented bugs in Hugs:

	mod154	module M where != module M(module M) where
	read023	Just.let x=id in x
	read033	1.0e+x
	read034	(3 + 4 +)
	read021	empty file
	tc084	monomorphism restriction and defaulting
	tc096	monomorphism restriction and defaulting

Also omitted tc144 for Hugs, because it loops.

Rename several .stderr files to .stderr-ghc, because in each case the
output consists of GHC-only warnings.

Update expected output

accept output

line comment test.

update output

Update some of the test output following introduction of accurate
source locations in error messages.  More updates to follow.

Add test for '\xa0', the ISO8859-1 non-breaking space character.

accept output

Add missing test

Add test for lexing '9e2'.

Update expected output

update expected output

read020 is wrong and obsolete

Move two multi-module tests into their own directories and make them
proper multi-module tests rather than ordered single-module tests.
The previous hack broke down when the profiling way was added.

Revamp the testsuite framework.  The previous framework was an
experiment that got a little out of control - a whole new language
with an interpreter written in Haskell was rather heavyweight and left
us with a maintenance problem.

So the new test driver is written in Python.  The downside is that you
need Python to run the testsuite, but we don't think that's too big a
problem since it only affects developers and Python installs pretty
easily onto everything these days.

Highlights:

  - 790 lines of Python, vs. 5300 lines of Haskell + 720 lines of
    <strange made-up language>.

  - the framework supports running tests in various "ways", which should
    catch more bugs.  By default, each test is run in three ways:
    normal, -O, and -O -fasm.  Additionally, if profiling libraries
    have been built, another way (-O -prof -auto-all) is added.  I plan
    to also add a 'GHCi' way.

    Running tests multiple ways has already shown up some new bugs!

  - documentation is in the README file and is somewhat improved.

  - the framework is rather less GHC-specific, and could without much
    difficulty be coaxed into using other compilers.  Most of the
    GHC-specificness is in a separate configuration file (config/ghc).

Things may need a while to settle down.  Expect some unexpected
failures.

Section precedence test

Add regression test for lexer bug when parsing "1.0e+x".

Add test for record declaration with zero fields.

Add a lexical comment test