Remove 'ref' from account.move.line preparation
As 'ref' is related to account.move.ref it is not needed
Fix multi move import
multi_move_import on the parser allows to generate 1 account.move
for each line in the imported file, instead of having all the lines
on the same account.move
Tonow-c2c
Holger Brunn
Akim Juillerat
Matthieu Dietrich
Florian da Costa