phase 22 Haskell: runtime.sx + 143 tests

lib/haskell/runtime.sx (113 forms): numeric type class helpers
(hk-div/mod/rem/quot floor semantics), rational numbers (dict-based,
GCD-normalised), hk-force for lazy promises, Data.Char (hk-ord/chr,
inline ASCII predicates, digit-to-int), Data.Set wrappers, Data.List
(take/drop/zip/nub/foldl/foldr/scanl/etc), Maybe/Either ADTs, tuple
helpers (hk-pair/fst/snd/curry/uncurry), string helpers (words/lines/
is-prefix-of/is-infix-of/etc), hk-show.

test.sh updated to pre-load runtime.sx alongside tokenizer.sx.
143/143 runtime tests + 5/5 parse tests = 148/148 total.

lib/haskell/test.sh

@@ -46,6 +46,7 @@ for FILE in "${FILES[@]}"; do
   cat > "$TMPFILE" <<EPOCHS
 (epoch 1)
 (load "lib/haskell/tokenizer.sx")
+(load "lib/haskell/runtime.sx")
 (epoch 2)
 (load "$FILE")
 (epoch 3)
@@ -81,6 +82,7 @@ EPOCHS
     cat > "$TMPFILE2" <<EPOCHS
 (epoch 1)
 (load "lib/haskell/tokenizer.sx")
+(load "lib/haskell/runtime.sx")
 (epoch 2)
 (load "$FILE")
 (epoch 3)