test/POD for $_ in map/grep
POD tweak
add flatten() test
implement flatten_all()
hide array flatten func
Merge branch 'flatten'

* flatten:
  hide array flatten func
  implement flatten_all()
  add flatten() test
Reorganize Role::Array POD

	modified:   lib/List/Objects/WithUtils/Role/Array.pm
	modified:   lib/Lowu.pm
Cleanups
Merge branch 'array-pod-reorg'

* array-pod-reorg:
  Cleanups
  Reorganize Role::Array POD
Hash; fix multi-key get(), backwards-incompat set() retval change

	modified:   lib/List/Objects/WithUtils/Role/Hash.pm
	modified:   t/hash.t