Metacat

added the returnfield element to be used for dynamically choosing which fields to return from xml_nodes.

added support for the returnfield parameter
-QuerySpecification now sets a flag (containsExtendedSQL) when there are returnfield items in the pathquery document.
the accessor method containsExtendedSQL() can be called by other classes to check for extended return parameters...

added support for the returnfield parameter
-added the dynamic parameters to the returned hash table of documents

added support for the returnfield parameter

marine.properties is no longer needed because the marine servlet uses all of the metacat properties.

a way to access the marine servlet without using javascript

updated the URL given the new <returnfield> paramet

Folded the functionality from DBSAXDocument into the DocumentImpl class.
Now DocumentImpl handles both the reads and the writes to the database.
Eventually, it will implment the full DOM Document interface. Eliminated
the DBSAXDocument.java file as it is no longer relevant....

Updated the readxml shell script to use the new DocumentImpl class instead
of the old DBReader class.

Removed DBReader.java because the functionality of that class has been
replaced by the more efficient DocumentImpl class.