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When building ghc-prim/Setup we weren't putting the hi files in the
right place.

This means that we don't have to make a Setup program for each library
individually, and also simplifies the build system a bit.

We were inconsistent about whether to use the name "MutArr#" or
"MutableArray#". Likewise ByteArr#/ByteArray# and
MutByteArr#/MutableByteArray#.

It leads to annoying rebuilding when working in a built tree.
We'll handle this differently for 6.10.

Many of the character types were wrong. Now the asc* names really do mean
ASCII, rather than latin-1.

Previously +RTS -Sstderr -RTS was required to send output to stderr,
but this is the most common usage and I got tired of typing "stderr".
The old default behaviour of sending output to <prog>.stat is now gone
(I don't think we use it anywhere).  

Temporarily we allowed +RTS -S- -RTS to mean stderr; there were
objections to this, so it is now also gone.

gcc 4.3 emits warnings for static inline functions that its heuristics
decided not to inline.  The workaround is to either mark appropriate
functions as "hot" (a new attribute in gcc 4.3), or sometimes to use
"extern inline" instead.

With this fix I can validate with gcc 4.3 on Fedora 9.