(est-eval-value-as-object): Accept `=title' as the same as `=name'.

(est-eval-value-as-object): Accept `=title' as the same as `=name'.
(est-eval-value-as-sources): New function.
(est-eval-apply-value):
- Use `est-eval-value-as-sources' instead of
  `est-eval-value-as-domain-list' for format
  `space-separated-domain-list'.
- Support new format `space-separated-source-list'.