- mongdb: * added preliminary gridfs interface * refactored some code * added new types for "gridfs" and "gridfile" * added new example file example-nsf-gridfs.tcl
- library/mongodb: * use type int32 * updated to new nx/nsf interfaces * updated for mongo-c-driver post 0.3 (supporting result MONGO_OK for mongo_cursor_next) * factored out "mongo cond" from "mongo query"