New Add/Edit product functions.

* controllers/_database.php : Coded Add and edit Product. Fixed
getproducts() - it was returning the array two times.
* controllers/_templating : Improved and added an if statment - To be
expìtended.
* index.php : added the two new queries (add/edit product).
* [*].less : Styles the form for adding/editing product.
* views/view.base.php :  Admin Panel accessible by clicking your name
(still need a way of protection).
* views/view.sidebar.php : Added the Admin sidebar.
* views/admin.base.php : First commit

Some minimal code changes.