top: misc tweaks to code/comments after pid adaptation

top: misc tweaks to code/comments after pid adaptation

. didn't need a separate table for enum pids_reap_type
since top's 'Thread_mode' itself can be used directly.

. with pids support & the loss of forest_based(), that
forest_adds() function had to be renamed so the prolog
comment regarding naming convention was still honored.

. adapted to a library change to the pids_reap struct.

Signed-off-by: Jim Warner <james.warner@comcast.net>
TOP, respond to library change to the pids_reap struct ...

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