Metacat

Removed the release ant token from all files in 'src'.

Added license terms to source code files, and cleaned up some javadoc
documentation in a few places.

Added "release" keyword to all metacat source files so that the release
number will be evident in software distributions.

Added feature to now ouput COMMENTs and PIs when the document is
read from the database with DBReader.

Merged in substantial changes to DBWriter and associated classes and to
the MetaCatServlet in order to accomodate the new UPDATE and DELETE
functions. The command line tools and the parameters for the
servlet have changed substantially.

documentation cleanup

minor changes to TextNode

updated documentation

code consolidation, cleanup, and documentation

renamed BasicElement to BasicNode

continuing work on changing to DOM Text node model