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Lookup the resfile in the supplied relational database. This is useful for processing different structures with different resfiles in the same protocol. The database db should have a table table_name with the following schema:
CREATE TABLE <table_name> (
tag TEXT,
resfile TEXT,
PRIMARY KEY(tag));
When this task operation is applied, it tries to look up the resfile string associated with the tag defined by
JobDistributor::get_instance()->current_job()->input_tag()
This task operation takes the following parameters: