Don't display errors for XML-RPC requests, as they malform the response.

fixes #23811. props kovshenin, markoheijnen.

git-svn-id: http://core.svn.wordpress.org/trunk@24564 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions improvements

* Consolidated router code
* Corrected routing behavior
* Tooltip model
* Removed mouse dragging code

props adamsilverstein, ocean90. see #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24565 1a063a9b-81f0-0310-95a4-ce76da25c4cd