Add tests for metadata encoder and parser as well as UTF-8 tests for BDF reader and writer
This also includes a commit to fix issues found in the metadata encoder and parser.
See merge request !58
Please note that this commit only uses the @Test annotation
where exceptions are thrown at the end of the test,
because otherwise the test would not be executed completely.
Examples for this are in DatabaseComponentImplTest where many exceptions
are thrown in close succession or in ConnectionRegistryImplTest where an
exception is thrown in the middle of the test.
