Fix #1369: TestSuite::addTestFile() performance + docs.
Fix #1369: False-positive matches in reverse-mapping of filename to classname.
Merge pull request #1369 from sun/perf-testsuite-addfile

Fixed performance of TestSuite::addTestFile() + missing docs
CS fix (via @webmozart).
Merge branch '4.1' into 4.2
Merge branch '4.2'