AMC-TXT: only the _implicit_ default scoring is cancelled if some manual...

AMC-TXT: only the _implicit_ default scoring is cancelled if some manual scoring is given for answers.

1) if no scoring is given for the question, choose DefaultScoringX
value

2) if no scoring is given and DefaultScoringX is empty, and if no
manual scoring is given for any answer, then chosse the implicit
default scoring (haut=2 for multiple questions).