import_from_file
Description:
public bool import_from_file (string file, HashTable<int,int>? cols_trans, Set options) throws Error
  
  Imports data contained in the file file into this; the format is detected.
Upon errors FALSE will be returned and error will be assigned a Error from
      the DataModelError domain.
Parameters:
| this | |
| file | the filename to import from | 
| cols_trans | a GenericSet for columns translating, or  | 
| options | list of options for the export | 
Returns:
| TRUE if no error occurred |