Use erlang:demonitor(Ref, [flush]) where applicable
Convert XML files to UTF-8, where needed
Convert XML files to UTF-8
Rename and document lists:zf/2 as lists:filtermap/2

This function is used all over the place in OTP itself and people
sometimes want that functionality, they may as well not reimplement it
themselves.
Merge branch 'maint'
versions updates for erl_interface, et and os_mon
Merge branch 'maint'