fileset: restrict getfileset() to not return a computed set (API)
And rename the functions accordingly. fileset.match() will be changed to
not compute the initial subset.
test-glog*.t get back to the state before 9f9ffe5f687c "match: compose
'set:' pattern as matcher."
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.