Hi,

Here's a preliminary patch that implements dh-sequence-doc-privacy,
allowing more compact usage of dh-doc-privacy when the default behaviour
of cleaning README.* files is enough.

- Add dh-sequence-doc-privacy to Build-Depends.

- Pass "--with doc-privacy" to debhelper, and add dh-doc-privacy to
  Build-Depends.

Debhelper may pass various arguments to the tool, which have to be
ignored. The test case testing for an error on unknown arguments has
been replaced by a test that passes a real debhelper option, and doesn't
produce an error.

This could be extended further by adding an optional configuration file
("debian/doc-privacy" ?) for situations where more files need to be
cleaned.

Comments?

This patch looks great. I'm going to apply it and release a new version.