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Repair coverage

The updated test system (t/Makefile) removed .coverage.* files in its
`clean` target before the top-level Makefile had a chance to aggregate the
coverage data using `coverage combine`.

We resolve the issue by supplying the COVERAGE_FILE environment variable
with an absolute path to the `t' directory. This causes coverage files to
be created outside of `trash directory` such that the coverage data avoids
being cleaned too early. This also has the effect of gathering coverage
files into one place such that `find` does not have to be used to find all
of them.

Also update the top-level `clean` target to remove the aggregate .coverage
file along with any stray t/.coverage.* files.

Signed-off-by: Peter Grayson <pete@jpgrayson.net>

1911 of 2586 branches covered (73.9%)

Branch coverage included in aggregate %.

6157 of 7255 relevant lines covered (84.87%)

1.69 hits per line