changed order form to use language files.
Modified attribute handling for products

- Reworked ER model (deleted one table, added another)
- Added slider and dropdown as attribute selectors
Updated product attributes handling

- Added defaults and units to attributes (ER model)
- Added JS to nicely display customizations
- Added "attribute_n=value" to "add to cart" link
Cleaned up header, added documentation

- Deleted breadcrumb (sorry fränzi :) )
- Added documentation to some functions
- Added a class to figure out ShoppingCart (needs discussion)
Updated Brainstorming, fixed footer and added checkout.php
adapted Registration form to same type as Order Form
updated translation txt's 
created regForm.txt
added OrderConfirmation class
included FPDF module
added link to print order confirmation
updated Brainstorming
commented line 74 in detail.php > $custom_attrs_suffix, causes the link
to the shopping cart not to work. @SIMON: PLEASE CHECK.

added function to OrderConfirmation to get Product detail.
added getProductInformation function to functions > this is used
everywwhere. 
improved Order confirmation PDF and the orderConfirmation Site
(sendorder)
deleted some alerts in planetshop.js
added values to orderForm fields, for quicker troubleshooting, this may
be removed in the end again.
deletet the last ts alert in planethop.js
updated Brainstorming.txt
Updated database, ER model and checkout process
Merge remote-tracking branch 'origin/fraenzi-branch' into simon-branch
Reviewed task from Fränzi

- Updated worklog (Brainstorming-ToDo)
- Re-added line (works as expected, try with a product that has "custom attributes"
Added product pictures

- Modified DB to no longer hold BLOBs but the image path
- Added logic to display product image to 'detail.php'
- Added three different product pictures
added ZendClientClass (unfinished)
Merge remote-tracking branch 'origin/simon-branch' into fraenzi-branch
Updated ER model to incorporate shoppingcart changes
adapted layout and css
Added experimental support for attributes

- Modified ShoppingCart to hold ShoppingCartProducts
- Edited ShoppingCartProduct (various bugs)
- Updated functions.php to handle adding / removing