Removed automatic deletionn of generated files.

Use clean method instead, for instance:

>> o = x13(y);
>> o.transform('function','log');
>> o.regression('variables','()');
..
>> o.run();
>> o.clean()

src/@x13/run.m

@@ -75,7 +75,4 @@ if ~all(cellfun(@isempty, struct2cell(o.forecast)))
 end
 
 % Save main generated output file.
-o.results.out = fileread(sprintf('%s.out', basename))
-
-% Delete all generated files.
-delete([basename '.*']);
\ No newline at end of file
+o.results.out = fileread(sprintf('%s.out', basename))
\ No newline at end of file