Fast cart addition
Fast cart addition

This brings down "add all" on all Telematik documents from a minute of
run time to about 2 seconds. This is more to show that the patch is
trivial than anything else.

fsmi/odie-client,TehMillhouse/odie-client,fsmi/odie-client,TehMillhouse/odie-client,TehMillhouse/odie-client,fsmi/odie-client