SearchWP 4.3.15

[Fix]** Error when using `mod` argument of `SearchWPQuery` parameters array
[Improvement]** Control over Settings page navigation

[Note]** Rebuilding your index using the Rebuild Index button on the Engines tab of the SearchWP settings screen is recommended after updating
[Fix]** Delta update regression introduced in `4.0.13`
[Fix]** Error when applying delta update to Source that no longer exists
[Improvement]** Handling of delta update process during failures
[Improvement]** Delta update queue handling during index rebuild

[Fix]** Issue where partial matches from keyword stems were not found in some cases
[Fix]** Partial match token processing limited to applicable site(s)
[Fix]** Excerpt generation when handling unregistered Shortcodes