Replaced the folder deletion procedure with the new single DELETE request (issue #2630)
Changed autorefresh to start at the end of initialization and check with if-modified-since to avoid useless requests
Fixed a NPE
Added retry capabillity to head requests
Added retries to delete commands and in case of error the process continues with the next object to be deleted
Implemented empty trash by deleting and re-creating the trash
Added a forgotten rerty
Empty trash deletes everything under trash by using the deleteFolder method
When moving files in and out of trash set the content-type explicitly
Added retries when getting errors while fetching folders (issue #2552)
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