pc/main.c		1991/0625		Created.
		1991/0629
		1991/0702
		1991/0703
		1991/0705
		1991/0706
		1991/0709
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		1997/0404
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		1997/0603
		1997/0606
		1997/1101
		1997/1104
		1997/1108
		1998/0420		Bug fix: avoid 32-bit overflow during memory computation.
		1998/0605		Bug fix: run scheduler on CPU page tables, not process page tables.
		1998/0825		Bug fix: print format.
		1998/0910		Comment edit. Add statics. Change intrenable to trapenable.
		1998/0916
		1998/1120
		1998/1124
		1999/0129
		1999/0217
		1999/0218
		1999/0422
		1999/0629
		1999/0709
		1999/0710
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		1999/0712
		1999/0713
		1999/0714		Remove poolconfig.
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		1999/1109
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		2000/0609
		2000/0721
		2000/1012
		2001/0123
		2001/0527
		2001/1011
		2002/0109
		2002/0114		Bug fix: print format.
		2002/0217		Add quotefmtinstall.
		2002/0323
		2002/0405
		2002/0410
		2002/0411
		2002/0412
		2002/0609
		2002/0703		Whitespace edit.
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		2002/0822
		2002/0824
		2002/0915
		2002/1010
		2003/0102
		2003/0326