Metacat

Code added to handle errors resulting from following urls:
http://metacat.nceas.ucsb.edu/knb/metacat?action2 - no action specified
http://metacat.nceas.ucsb.edu/knb/metacat?action=insert - no docid specified
http://metacat.nceas.ucsb.edu/knb/metacat?action=login - no username specified...

Added check for null condition so that proper error text is returned to user.

Checked to be sure the instance has been initialized in the getDBCOnnection
static method call. Assuming it has been initialized could (and does)
lead to NullPointerExceptions when used outside of the metacat servlet
if the conneciton pool isn't initialized properly.

Reformatted code for readability. It was crazy. Still has problems, but its
better. Will be working on some new methods on monday.

Fixed a bug in access handling when no access is specified.

Added eml-2.0.1 tags for eml processing.

Also fixed a bug. The error returned in case of no revision number specified was just null. Now it says that revision number is required.

Merging in changes made in branch 'dataaccess' by Jing Tao.

Added upload functionality to metacat client for upload online data

Add warning if default harvest list file is not found on disk.

Change relative path to harvestList.xsd schema to allow harvest list editor to run standalone.