Add a "no_distribution" map init function.
Create a map even for the 'n' dist case.

Also, fix tests that test how many maps a LocalArray has.
Add the tests.
Simplify local_shape computation...

now that no-distribution dimensions have a map.
Add more tests related to LocalArray size and shape.
Merge branch 'master' into feature/add-trivial-no-distribution-map
Rename "no_distribution" to "not_distributed".