Add SecurityDisabler to make sure if debug is enabled but you aren't signed in to Sitecore you can still resolve serialization roots
Add warnings to control panel if predicate does not resolve to any valid roots
Fix bugs relating to non-standard serialization roots and path normalization
Fixed a bug in the retryer that was incorrectly retrying tree failures as individual item failures, which caused them to 'succeed' (if the individual item load was ok) and swallow the tree load error
Fixed custom serialization root handling, again. Darn PathUtils.