Refactored md_reservation_form.php, Fixed product reservation

1. Refactored md_reservation_form.php into md_reservation_functions.php
2. md_request_quotation fixed message output error.
3. Fixed view display for user info on quotation , on the admin panel.
4. Tweaked ajax js for the reservation animation and cancel and approve
buttons.
5. Change title header for reservation columns.
6. Fixed resursion memory overflow due to action before_delete_post,
replaced with hook delete_user.