I have expanded my work on whitespace.el to address other problems.

First, I revised my previous patch, which had an error in the new version
of whitespace-empty-at-eob-regexp.

Next, I removed some duplicate documentation from the Commentary section:
it was already out of date in one or two places, and it duplicated
information readily available in docstrings.

Next, I fixed some problems with whitespace-space-after-tab-regexp.

Finally, I fixed whitespace-report-region to respect user settings: it no
longer returns true when the region has a problem not covered by
whitespace-style; however, it still diagnoses and reports all possible
problems.

There's one more problem with whitespace-report-region I would like to fix,
which is that currently the force parameter changes whitespace-style
globally; it should, I believe, only change it for the duration of the
function.

I'd appreciate some review of these patches (all against current git
master).

TIA!

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