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Plus remember to zonk the free_tvs in TcUnify.newImplication

# ./aw 
aw: file descriptor 1027 out of range for select (0--1024).
Recompile with -threaded to work around this.

When a BCO with a zero-length bitmap was right at the edge of
allocated memory, we were reading a word of non-existent memory.

This showed up as a segfault in T789(ghci) for me, but the crash was
extremely sensitive and went away with most changes.

Also, optimised scavenge_large_bitmap a bit while I was in there.

You can now run "make test" in the root, and the fast testsuite will be
run with cleaning enabled. It will also put the summary in
testsuite_summary.txt.

It's never worked properly, and the information is in ":show linker".

And set hp2ps's EXTRA_LIBRARIES. Based on a patch from Sergei Trofimovich.

This is so that the SIGPIPE handler gets reset to the default
automatically on exec().

This fixes rerunning configure in a tree which already has an inplace
directory. Edward Z Yang ran into this; I guess whether it actually
fails depends on details of your installation, or we'd have run into
it sooner.

I had do to some refactoring to make this work nicely
but now it does. I can't think how this escaped our
attention for so long!

See Note [When to eta expand]. The idea is that dictionary
lambdas are invisible to the user, so we shouldn't eta
expand them.

use of the latter caused problems for Claus Reinke's macros that
redirect stdout.

This is a follow-on to Simon's patch yesterday, developed
with him.  It cleans up the computation of how packages
are installed, and installs the right ones.

Put it back on when my patch is applied to the containers repo.
(the one that removes two refuable lambdas)

and increase its default value. This makes overloaded functions
a bit keener to inline.  Which fixes Trac #4321