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print GHC's version in the panic message

Clean up the error handling a bit; the exception type is moved to
Panic, and a new exception for panics has been added.

Move FAST_INT and FAST_BOOL into their own module FastTypes, replacing
the macro definitions in HsVersions.h with real definitions.  Change
most of the names in the process.

Now we don't get bogus imports of GlaExts all over the place, and
-fwarn-unused-imports is less noisy.

glasgow-haskell-{bugs,users} has moved.

import list tweak

Add utils/Panic.lhs