update_AbiN

Add description and unknown mechanism for AbiN #255 (closed)

added DefenseSystem label

requested review from @jcury

assigned to @ftesson

added 72 commits

• bd4146a3...9fd810f9 - 71 commits from branch main
• f9bf008b - Merge branch 'main' into ftesson_abin

Compare with previous version

merged

mentioned in commit 847d0b74