Metacat

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

Metacat has had problems with threading issues when accessed from ecogrid. These problems may stem from the use of shared global variables within the servlet that are not protected against threading problems. We used a lot of these, which I am eliminating in this commit. Besides final variables used as constants (which are not a problem), now there are only three unprotected variables (sessionHash, logMetacat, and conn) which are harder to eliminate. I will be discussiong this with Sid tomorrow to see how to eliminate them.

Revise code to make validateion work.

Merge DBConnection branch to head.

added precise location information (class.method) to each catch statement so that errors are more easily traced.

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.

Fixed bug in DBEntityResolver so that it now properly delegates to
the system id found inthe database.
Changed DBValidate to use DBEntityResolver, rather than the OASIS
catalog, and to return validation results in XML format.

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.

1) Simplified database connection creation by adding new utility routine in MetaCatUtil that reads configuration information from the properties file.
2) Created MetaCatUtil.getOption() to retrieve options from properties file.
3) Unified SAX Parser creation by specifying parser driver in the properties file and dynamically loading it using the XMLReaderFactory interface....

documentation cleanup

changed location of catalog file to config parameter

added catalog loading code

GenericXMLValidate added to same package as MetaCatServlet

added GenericXMLValidate