Metacat

Somehow missed adding in javadoc for read(). Here it is.

For now, getSystemMetadata() will be private like the other *SystemMetadata() methods.

Modified MetacatHandler, updated the getSystemMetadata() method to now use read() and deserializeSystemMetadata() to produce the SystemMetadata object. Exceptions are pushed up the stack, and so accordingly, modified createSystemMetadata() to reflect the changes.

Modified MetacatHandler, added createSystemMetadata() - generates SystemMetadata objects for newly inserted data or documents. This is intended to be used from handleInsertOrUpdateAction(), and only for documents being inserted from clients that don't support the DataONE interface. The method parses EML documents to discover data entities, and updates the system metadata for those entries, with support for describes and describedBy metadata. Currently doesn't handle FGDC, etc. documents....

Modified MetacatHandler, added three methods:
getSystemMetadata() - returns a SystemMetadata object from the systemmetadata table using the given GUID. Stub only.
updateSystemMetadata() - updates the systemmetadata table using the given SystemMetadata object....

Modified MetacatHandler and added two methods:
serializeSystemMetadata() - Serialize a SystemMetadata object to XML string
deserializeSystemMetadata() - Deserialize a SystemMetadata object from an XML string

Modified MetacatHandler, added read() - Read a document from metacat and return an InputStream. The XML or data document should be on disk, but if not, read from the metacat database. This method should be optimized, along with others, to not write stream data to disk for performance reasons.

To support generation of SystemMetadata and GUIDs, added a number of methods to MetacatHandler that are also in CrudService(). CrudService should eventually be refactored to use the handler methods. Added:
readFromFilesystem() - Read a file from Metacat's configured file system data directory, and return a FileInputStream. This code has been factored out of handleInsertOrUpdateAction()....

fixed bug where the wrong checksum alg got written to the db

added file extension for txt or csv files