Fixed semantic bugs.
Replaced List with Set.
Added more annotations.

and removed one field and two methods.
Merge branch 'master' into test
Added more tests.

1
Tests: Friendler error messages.
Merge branch 'test'
More friendlier error messages.
Merge branch 'master' into FindBugs
Fixed FindBugs warnings.
Added more checks to CommonLogger and fixed LogPriority.
Merge branch 'FindBugs'
Added LogFactory.
Removed LoggingContext.
Fixed NPE.
Fixed (most) failing tests.
Added TTCC-like formatter.
Fixed some small bugs.
Added more priorities and OutputStreamRedirector.

OutputStreamRedirector redirects output to an outputstream to a
LogChannel.
Added IncrementingFileChannel.