Display build status.
Lift list of supported instances to top-level.
Improve error message about unknown PTS instance.
Handle errors in command-line parsing via ErrorsT.
Improve formatting of errors without position.
Activate fomega.
Add PTS instance synonym 'fomega'.
Comment out uses of the Errors monad

This still does not fix the problem, just reduces the retainer set to:

PTS.Process.Main.processJob,PTS.Process.Main.processJobs,PTS.Options.parseCommandLine,PTS.Process.Main.main,Main.main
Merge branch 'master' into topic/profile

Conflicts:
	src-lib/PTS/Process/Main.hs
Switch to strict Writer monad

We know this does not fix the leak, but let's exclude this anyway.
Maybe we need to disable this *and* more things to fix the leak.

Also, in fact the profile does look different. -hblag -hd shows less
memory being used.
Switch to strict State monad

This is useful for instance for Control.Monad.Log.