phkmalloc/2

"zero' and 'junk' options to help find and diagnose malloc abuse.
EXTRA_SANITY defaults "junk" to on.
Don't dump the internal state, unless EXTRA_SANITY.
General code cleanup.
Error messages cleaned up a bit, more checking earlier.
EXTRA_SANITY is default at this time (just in case).
Performance (without EXTRA_SANITY) is better, beats gnumalloc in
both time & space most of the time:

	# In-memory test.
	./malloc 50000000 2000 8192
	159.2u 1.5s 2:41.85 99.3% 5+7742k 0+0io 0pf+0w
	./gnumalloc 50000000 2000 8192
	272.6u 0.4s 4:35.01 99.3% 5+8533k 0+0io 0pf+0w

	# Swap-space test.
	./malloc 500000 14000 8192
	6.5u 4.1s 4:08.87 4.3% 5+49209k 0+0io 9772pf+0w
	./gnumalloc 500000 14000 8192
	16.2u 14.5s 15:36.14 3.2% 5+54100k 0+0io 47651pf+0w

	# Small items test.
	./malloc 20000000 20000 2048
	67.0u 0.3s 1:07.83 99.2% 5+18199k 0+0io 4pf+0w
	./gnumalloc 20000000 20000 2048
	66.2u 0.3s 1:07.03 99.3% 5+18107k 0+0io 0pf+0w

SANITY is not an option anymore. (!!)

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