Fix erlang:is_process_alive/1
erts: Fix copy error in erlang:delete_element/2

Off-by-one error in element copy.
erts: Refactor erlang:insert_element/3 for clarity
Be less eager requesting wakeup for cleanup jobs
Fix `+sws' and `+swt' system flags
Make port close not be delayed

Drivers are dereferenced when the port is completely gone, in the operation
scheduled with erts_schedule_thr_prgr_later_op. If we use
erts_schedule_thr_prgr_later_cleanup_op, it may not happen
for a long time and the driver can not be unloaded.

We can not dereference the driver before the thread_progress_later
thing, because references to the driver may exist in other threads, so
the unloading of the driver may free locks held by other schedulers and
whatnot.
Merge branch 'rickard/is_process_alive/OTP-10926' into maint-r16

* rickard/is_process_alive/OTP-10926:
  Fix erlang:is_process_alive/1
Merge branch 'rickard/thr_prgr_later_op/OTP-10994' into maint-r16

* rickard/thr_prgr_later_op/OTP-10994:
  Make port close not be delayed
  Be less eager requesting wakeup for cleanup jobs
Merge branch 'rickard/sys-flags/OTP-11000' into maint-r16

* rickard/sys-flags/OTP-11000:
  Fix `+sws' and `+swt' system flags
Merge branch 'egil/r16/fix-delete_element/OTP-10932' into maint-r16

* egil/r16/fix-delete_element/OTP-10932:
  erts: Refactor erlang:insert_element/3 for clarity
  erts: Fix copy error in erlang:delete_element/2
Prepare release
ssl & crypto: Documentation enhancements

OTP-10450
Merge branch 'maint-r16' into maint

Conflicts:
	erts/vsn.mk
Fix typo in type: erlang:process_info_item()

'message_que_len' should be 'message_queue_len'.
Merge branch 'ia/ssl/crypto/PSK-SRP/doc' into maint

* ia/ssl/crypto/PSK-SRP/doc:
  ssl & crypto: Documentation enhancements
Remove unused Postscript files
Merge branch 'hb/remove_unused_ps_files/OTP-11016' into maint

* hb/remove_unused_ps_files/OTP-11016:
  Remove unused Postscript files
Updated preloaded for erlang.erl
Merge branch 'dg/win_icon' into pu
Merge branch 'rc/break-out-asserts' into pu