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This required moving PackageId from PackageConfig to Module

This fixes a problem with spurious recompilations: each time a module
was recompiled, the order of the children would change, causing extra
recompilation.

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test case is driver062.5

On FreeBSD FD_SETSIZE is unsigned. Cast it to a signed int
for portability.

addDLL returns const char*, not just a char*.
Fix compiler warning

`set -o igncr' does not work on non-cygwin-systems.
Fail silently if this command does not work, instead
of aborting the build.

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Lexing of the doc options pragma was changed, but but no change was 
made to the parser to reflect that. This patch fixes this problem.

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- This fixed the failures of GMapAssoc and GMapTop for optmising ways

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  It turns out the newtype handling code in :print
  was slipping non mutable Tyvars in the types reconstructed.
  The error message eventually produced was rather obscure:
  
  [src/Tp.hs:75:28-64] *MainTp> :p x
  *** Exception: No match in record selector Var.tcTyVarDetails
  [src/Tp.hs:75:28-64] *MainTp>
  
  Due to non mutable tyvars, unifyType was failing.
  A well placed assertion in the unifyType code would have made
   my life much easier.
  Which reminds me I should install a -ddump-* system in the 
  RTTI subsystem, or future hackers will run away in swearing.


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  In Os X for instance, by default we have TERM=xterm-color 

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This actually didn't break anything, as the shell expanded $pkgid to the
empty string, but it was still wrong.

further attempt to fix #1391 on MacOS

Using -stubdir together with hierarchical modules, -fvia-C, and --make
is essentially broken in 6.6.x.  Recently discovered by Cabal's use of
-stubdir.

Test cases: driver027/driver028 (I've updated them to use -fvia-C, in
order to test for this bug).

Patch from Clemens Fruhwirth

It turns out I didn't get it quite right in the case of compacting
collection.  This should make it work again.

Document the rules for pragmas that must occur at the top of a file.

Please merge this patch