Subsites D7 subsites.blockvis.inc needs work - form hook code is still tailored to D6 API.

subsites_form_alter_block_visibility() builds up its $form visibility settings under page_vis_settings, which is the D6 way. I'm still puzzling through D7 examples to suggest changes. Furthermore, *I think* $delta isn't being set somewhere and Block Classes (http://drupal.org/project/block_class) is expecting it to (Block Class not working for blocks with no delta values) but I may be wrong.

Yes, I know, Subsites D7 isn't even "officially" dev yet, but I do hope to do my part to push this along.