Queries improved

Queries need to be generalized so that they can be made more useful for reporting when its available.

search by type
search by states
search by importances (include none)
search by urgencies (or due date) (include none)
search by projects (include none)
search by users (include unassigned)
search by iterations (include unassigned)
search by releases
search by unit tested
search by verified
search by frequency
search by severity
search by creation date range
search by modified date range (on history items)
search by completed date range
search by time log date range
search bt comment date range