Changes the default number of walks to 30x ndim (previously 10x ndims).

The default settings are insufficient for the pp-tests of the high-spin 128s basis to pass (#388 (closed)). This changes fixes that. The downside of this is it is setting out default settings by CBC inference. So people doing "easier" problems will need to tone down the settings.

CHANGELOG.md

@@ -5,7 +5,9 @@
 ### Added
 - 
 ### Changed
-- 
+- Dynesty default settings changed: by default, now uses 30xndim walks. This was
+shown (!564) to provide better convergence for the long-duration high-spin tests.
+
 ### Removed
 -