Fix the media index test cases for the new index name
Adapt the namespace move test to the new options for media files
Fix a strict standards error in action.php
Renamed the pagemove plugin to "move"

Note that all class and event names that contained the name "pagemove"
have been renamed to the same name without "page".
Remove the "pm_" prefix from all language string identifiers

The prefix was still a leftover from the old pagemove plugin and isn't
needed at all.
Import metadata of the pagemove plugin (from before the rename)
New version released, first version of the move plugin