more friendly errors

Conflicts:
	app/views/layouts/application.html.haml
	public/500.html
	public/503.html
Revert "more friendly errors"

This reverts commit 5570360ddd6cd350e9751050ad1c1356e7fefc2b.
infrastructure for handling errors with exceptions
mailall: hide deleted groups
fix orderdoc when file not found
allow to config margin display on profile
refactor order helpers (see foodcoop-adam#126)
improve receive and distribute (see foodcoop-adam#126)
redesign fax pdf
use new Mollie API
add payment details to financial transactions
show payment details in finance + ordergroup home
allow to skip notification after transaction
use financial transaction payment details with Mollie API
Support more complex Mollie transaction fees.
fix signup plugin after transaction change
fix Mollie buglets
show proper error when all articles are deselected in order edit
add pickup day to orders
first iteration