participants-database.php
fixed bug where frontend record edits try to go to admin page on submission

PDb_Base class
added legacy method Participnats_Db::get_image_url()

PDb_List class
list limit setting can now be set to -1 or 9999999 to show all records with no pagination

PDb_Pagination class
changed order of property setup so the list limit value can be set to the total records value when an unlimited list length is specified

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@814536 b8457f37-d9ea-0310-8a92-e5e31aec5664