Source file header

Since i got a tip that the JNode sources do not contain the LGPL license, which they should, I'm adding a standard file header to all of JNode's source files. This header can be in the all/template directory.
The only files in our archive that will not have this header are the classpath files. They already have a suitable classpath header.

For all new files, please add this header yourselves.

Ewout