Metacat

Modified metacat to now provide the session identifier in the response
xml message when a login is called. This has not been fully tested.
I removed the HttpMessage class from metacat in favor of using the version
of that class that is found in the utilities module. This may cause some...

Fixed a bug for importing package

Fixed the bug that if path query without xml declaration will cause a non well-formed result doc.

A sample application program to call metacat string service.

Fixed some bugs in this file.

Implementation for the interface.

Add a new client interface with string type for web service.

in toxml method, add new code to handle dtd.

Add a new constructor to hanlde DTD node.

Add code to handle public id and system id.