* TESTPAT: Add 16 tests.

* TESTPAT: Add 16 tests.

* ew-data.el (ew-separate-eword): Check
`ew-permit-null-encoded-text'.

* ew-quote.el (ew-quote-concat): Use `ew-encoded-word-regexp0'
instead of `ew-encoded-word-regexp'.
(ew-quote-sole): Ditto.

* ew-var.el (ew-encoded-text-regexp): Abolished.
(ew-encoded-text-regexp0): Renamed from `ew-encoded-text-regexp'.
(ew-encoded-text-regexp1): New constant.
(ew-encoded-word-regexp): Abolished.
(ew-encoded-word-regexp0): Renamed from `ew-encoded-word-regexp'.
(ew-encoded-word-regexp1): New constant.
(ew-anchored-encoded-word-regexp): Use `ew-encoded-word-regexp0'.
(ew-type2-regexp): Use `ew-encoded-word-regexp0'.