edit_participant.php
changed the module designation to "admin-edit" since i'm using it now

PDb_admin.css
changed z-index of the tab mas so it goes under the flyout menu

PDb_FormElement class:
get_field_value_display() image-upload handler modified to allow the admin edit script to show images
_upload() method added to override the parent method because it has a call to a static method" PDb_FormElement::get_field_value_display()

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@809454 b8457f37-d9ea-0310-8a92-e5e31aec5664