Fall back to the target key if a target option is not available. This avoids an ugly notice and allows for processors offering dynamic targets that can be added on the fly.

#840350 lyricnz: (Optionally) Transliterate enclosure filenames to provide protection from awkward names.

#783098 elliotttf: Introduce hook_feeds_user_processor_targets_alter(), mapper for user profile fields.

#783820 klonos: Fix warning: copy() [function.copy]: Filename cannot be empty in FeedsParser.inc on line 168.