top: exploit those new library task/threads provisions

top: exploit those new library task/threads provisions

This patch adapts top to exploit the new <proc/pids.h>
interface. And it appears to have reduced top's weight
by a considerable margin. Gone were the sort callbacks
and manipulation of those library flags. Gosh, all top
needs to do now is track some enumerators of interest.

[ whoa, wait just a damn minute. it now appears some ]
[ that weight loss was solely the result of a theft. ]

[ jeeze, we turn our back for just a minute & newlib ]
[ up & steals our pids hashing logic for his history ]
[ needs. oh well, i guess life's just not that fair. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>