Filter/argument to show nodes that a certain user is author/created a revision

This patch allows to setup a filter/argument which returns just the nodes where the current user created OR created a revision.

This is for example needed for wiki-like pages where the interests of the user should be displayed.

I'm wondering whether

+class views_handler_filter_node_uid_revision extends views_handler_argument_comment_user_uid {

is good. Perhaps some of this code has to move in another handler.