nhc98 implementation limits

Compiler limits. There are some arbitrary limits in nhc98's Prelude:

Prelude.hs	largest Eq instance for a tuple type	15
Prelude.hs	largest Ord instance for a tuple type	15

Runtime limits. There are various limits hard-coded into the runtime system, whose configured settings are:

node.h	max number of constructors in a data type	512
MAX_FILE_NAME	max length of filename for profiling	80
MAX_CDATA	max open files + ForeignObjs	1024
HEAPSIZE	default heap (change on commandline)	100000 words
STACKSIZE	default stack (change on commandline)	20000 words

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