main css style up for modal forms
table2: filter added fields override for order_by
categories: added settings: BOX_LEVEL_SPACER, BOX_LEVEL_MARKER
manage shop: filter for products and orders updated
form2: html_control() added param hide_empty
manage shop: filter up
form2: hide_empty now can be applied to almost any element
categories: added ability to show in select items limited by given parent item, cleanup
manage_shop: supplier2admin: added main_cat_id and implemented limitign only his categories in selects