Externalised FileUtils, Cut Dependencies ...

FileUtils contains functions for opening and reading/writing files. (zip
too)
(Have to test gzip outputstream!)
Removed static dependency of CDM2RDF from PGN2CDM ...
Set gzip output for simple converter. (Use of PGNConverterSimple is
discouraged!!! Don't use files larger than 10 MB!!!)
(BufferedOutputStream good or bad choice?)