upload class for metacat harvester
Field data will be normalized.
Add code to hanlder wirte and update funtion.
Add code to write relation table.
Add some debug message.
add code to make sure subject, relationship and object is not null.
Add delete access subtree in delete method.
Get the file size limit from property rather than hard code.
Don't write online data id into db.
Fixed bug to find catalog id for eml2 document.
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