* 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

* john/erts/bs_get_binary2-heap-binaries/OTP-15977:
  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

* maint:
  Handle clicking links more than once in Observer's "Expanded term"

* upstream/pr/2201:
  Handle clicking links more than once in Observer's "Expanded term"

OTP-15980

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.

* maint:
  mnesia: Bump protocol version
  mnesia: Introduce sync_asym_trans protocol
  observer: Fixes for html viewers
  observer: Support darkmode gui

The added make target is described in HOWTO/TESTING.md.