May be used in several ways:
# Get deleted revisions for a set of pages, by setting titles or pageids. Ordered by title and timestamp.
# Get data about a set of deleted revisions by setting their IDs with revids. Ordered by revision ID.
Operates in three modes:
# List deleted revisions for the given titles, sorted by timestamp.
# List deleted contributions for the given user, sorted by timestamp (no titles specified).
# List all deleted revisions in the given namespace, sorted by title and timestamp (no titles specified, $1user not set).
Certain parameters only apply to some modes and are ignored in others.