gfplot utilities
inject_filter(sql_precode, species, sql_code, search_flag = "-- insert species here", conversion_func = common2codes)
| sql_precode | SQL go to inject before a species list etc.  | 
    
|---|---|
| species | A vector of species or similar objects.  | 
    
| sql_code | The SQL go to operate on.  | 
    
| search_flag | What to search for in terms of where to inject the code.  | 
    
| conversion_func | A conversion function to apply to the species or related vector.  |