massBreakdown: Onboard Systems according to ATA100

[YaCabac]

It is proposed to change the massBreakdown of the (onboard) systems from Airbus Weight Standard (AWS) to ATA100. This would be a good alignment to the future powerBreakdown which is usually also broken down according to ATA100 (at least for conventional system architectures). However, there is the challenge to keep the overall mass breakdown completed meaning not to foget or double account something. There have been first efforts made on the translation from AWS to ATA100 (see following figure). A working group should be established, look into detail and discuss wether this change would be beneficial.