Bug 157520 -- dragging a bookmark into a tab no longer leaves things in a bad state. Bug 154906 -- dragging links onto tabs works now.
Changes include adding the bookmarks outline, and the boomarks toolbar as recipients of NSStringPboardType data, and replacing calls to [NSPasteboard propertyListForType], which tries to parse a url string into a property list, with [NSPasteboard stringForType].
even after it had been deleted. Also changes focus when losing key status so
the field editor gets properly released. We seem to have lost the outlets
in the bm sidebar for the info and edit buttons, re-add and re-attach them
and ensure that they are disabled when there is no selection (bug 159655).