API:

API:
* BREAKING CHANGE: list={backlinks,embeddedin,imageusage} now return an array with keys 0, 1, 2, ... (list) rather than an array with pageIDs as keys (hash table/associative array) for consistency with other list= modules.
* Attempting to fix an error about "Invalid title ``''" (i.e. empty string as title) I encountered at Wikipedia.