Displays only service attributes of type payment or delivery

Others like payment/gpg won't be printed to avoid confusion
Implements mail view helper for accessing the mail object in views
Removes old confirmation e-mail infrastructure in favor of the new one
Adds default implementation for isCachable() and _setViewParams()
Extends TestHelper::getView() to be able to provide a custom config object

This is necessary to enable setting config options in the tests that should be available in the view
Implements order payment e-mails
Rearranges some CSS blocks for easier copying to the e-mail templates
Adds new translation strings from payment e-mails and translations to German
Removes unused EMAIL_ACCEPTED status constant (superseeded by EMAIL_PAYMENT)

XXX: API change
Removes old confirmation e-mail job in favor of generic payment e-mail job
Implements new job for sending e-mails for payment status changes
Adapts mshop_order indexes for optimal performance
Merge branch '2013-12-15_email-infrastructure' of https://github.com/nsendetzky/arcavias-core into 2013-12-15_email-infrastructure