Minor DADA bugfixes.

[cczhu]

Fixed passing squeeze to DADA opener; minor docs fixes. Found these while making GUPPI.

Happy to propagate these to 1.0.1 as well if approved (though they're small enough that maybe it doesn't matter).

[mhvk]

Looks good, but... could you add a test? And an entry in CHANGES.rst, under bugs?

Since this is an actual bug, it should indeed be backported.

[cczhu]

Sorry about the oversight - there are now tests and a mention in the changelog (hope the linking works in the docs). Once approved I'll make the same changes and release 1.0.1, then create a PR updating the changelog with the release date.

[mhvk]

@cczhu - thanks for the updates. For future reference (not important enough to worry about adding it here): when adding a test for a specific bug, it is often handy to refer to the bug issue in the comment to the test (something like "regression test for gh-211").