show scoring values in catalogue mode (Feature #346)

In catalogue /answers printout mode you see details that are not available in normal (exam) paper mode.
In particular, you see the question-id and the correctchoice boxes ticked.
It would be nice if the scoring value for each choice would also be available, in particular for those cases where a wrong choice still delivers points.
It would be sufficient to let the scoring command have a silent (exam mode) and a verbose mode (in catalogue/answers mode) and print the information on the spot where the scoring value is given.
This is typically at the beginning of the question or questionmult of after a choice with a \scoring value.