Significant usability issues for admin registrations.

Significant usability issues for admin registrations.

Fixed problem with submitting account E-Mail not being available to send message in checkoutUpdateInventoryAndNotify()
Now adding E-Mail address to create account form after checkout
Added sort option to attendee export
Removing 1969 dates (0 timestamp) in "Time Selected" picklist in Event Attendees list.
Reoganized parmeter initialization and view data for admin/registrations/events.php and sub-models. Now with appropriate model.
Added enhanced multi-pick for selection of attnedees by status and other search enhancements to registrants list.
Cleaned up missing parameters due to reorganizing parameters.
Added links from requests list to request detail and if still in cart to front-end cart.
Added links from registrants list to request detail and if still in cart to front-end cart.