slabtop: adapted to exploit new alloc & sort interface

slabtop: adapted to exploit new alloc & sort interface

In addition to the new interface several other changes
were made. In fact, there are so many I must apologize
in advance to Craig, et al. for the hatchet I wielded.

Among the changes was my attempt to shrink the body of
that main() function. It's amazing how some folks must
always cram as code much as possible into  ol' main().

Personally, unless it's a throwaway quick & dirty pgm,
all main function bodies should not exceed one screen.

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