remove duplicated number_helper tests in AP. They are already in AS.

With 155cd5e6 the number_helpers were moved into AS all the tests were copied over
but the tests in AP were not deleted. This is confusing.

I removed all duplicated tests and reorganized the tests in AP to only test the
functionality, that is added in AP.
cleanup AP number_helpers_test

* use 1.9 style hash syntax
* don't use brances on assert_equal
* prefere " over '