- mongodb interface: * mongo::gridfile::seek: added a seek command for gridfiles * added example for the low-level interface to shwo how to access gridfs via the plain mongodb interface, how to add some additional metadata (e.g. dublin core meta data) and how to retrieve this via the gridfile interface
- mongdb: * added preliminary gridfs interface * refactored some code * added new types for "gridfs" and "gridfile" * added new example file example-nsf-gridfs.tcl
