more place + removed not needed parameters

errors.

Added more description for "Disable username change" feature

are not available

falls back to the photo if photo_big is not available; and is empry, if
no image is available for a user
Added Rules action to save remote file to the managed file entry and
return this file object back to Rules - this allows to save user image
to any image field in Drupal (for instance, attached to a user profile)