first stab at summarising processes by their ancestor chain
cosmetic
include the named processes in the sums
wire in sum_processes for all non-plugin process memory
deal with plug-ins
...and rip out the now unused sup traversal code
lists:keyfind/3 is not in R12B-3.
leave OtherProc info as is
fix a (harmless) bug spotted by dialyzer
the original code only worked since orddict:to_list is implemented as
the identity function.
add some specs and docs
Merge bug25512