prog: reduce amount of hint replacements

Several optimizations to reduce amount of hint replacements:
1. Don't mutate int's that are <= 8 bits.
2. Don't mutate data that is <= 3 bytes.
3. Restrict mutation of len only value >10 and < 1<<20.
   Values <= 10 we can produce during normal mutation.
   Values > 1<<20 are presumably not length of something
   and we have logic to produce various large bogus lengths.
4. Include all small ints <= 16 into specialInts and remove 31, 32, 63
   (don't remember where they come from).
5. Don't produce other known flags (and combinations) for flags.

And a larger part computes groups of related arguments
so that we don't try to produce known ioctl's from other known ioctl's,
and similarly for socket/socketpair/setsockopt/etc.
See comments in Target.initRelatedFields for details.

Update #477

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