* maint:
  erts: Create heap binaries in binary:split/2-3
  erts: Create heap binaries in binary_part/2-3
  erts: Create heap binaries in split_binary/2
  erts: Create heap binaries in bs_get_binary2
  erts: Remove size check in bs_start_match
  erts: Disallow binaries whose size in bits exceeds UWORD_MAX

ErlSubBin is a large struct that often dwarfs the region of memory
it points at, and it's common for them to refer to a ProcBin which
must be kept around as long as the SubBin lives, using up even more
heap space and keeping the referenced binary alive regardless of
how small the sub-binary is.

Propagate seq_trace tokens to spawned processes

Trace tokens can be lost when a process delegates message sending
to a child process, which is pretty surprising and limits the
usefulness of seq tracing. One example of this is gen_statem:call/4
which uses a child process to implement timeouts without the risk
of a late message arriving to the caller.

This commit attempts to remedy this by propagating the trace token
to spawned processes, and adds optional tracing for process
spawning as well.

* siri/cuddle-master:
  Update sasl/test/test_lib.hrl with recent versions of kernel and stdlib
  [logger] Fix faulty report_cb in logger_disk_log_h_SUITE:logging/1
  [cdv] Update compiler directive for release compatibility
  [reltool] Make test pass when $ERL_LIBS is set

In crashdump_viewer test, the helper module must be loaded on earlier
releases (major-2), so it has a compiler directive. This was r18, but
is now changed to r20.

* maint:
  [xmerl] Fix detect charset crash
  [cdv] Check only own persistent terms in crashdump_viewer test
  Fix remote-call error in ms_transform

Conflicts:
	lib/observer/test/crashdump_helper.erl