treewide changes to convert incorrect usages of string.Length() to string.IsEmpty().
thanks to afatecha@idea.com.py (Ariel Fatecha) for the patch. r=dwitte, sr=jst.
got the ok from Asa to land into a closed tree.
Bug 205378 - Meta bug for changes in bookmarks sorting code
r=jag, sr=sspitzer, a=sspitzer,asa
The CloneResource() has been back ported from Firebird, originally
implemented by Pierre Chanial.