Added coopurl to config
When no future order date, don't display any irrelevant menu items, and display informative message; when future order date is available, display information about it on the home page: split out home.tpl from index.tpl to achieve this.
Handle lack of purchase history better.
Fixed defects in enabling/disabling suppers from supplier panel and date administration:
- was not supporting NULL quantity_available when updating product_calendar
- date parsing wasn't working when displaying availability in date administration.