PartCrewManifest broken in KSP1.2pre

[pellinor0]

see forum thread:
http://forum.kerbalspaceprogram.com/index.php?/topic/149405-changing-crewcapacity-of-a-part-in-the-editor/

[pellinor0]

partly fixed by fe2f383: now additional seats are not shown in the editor.

There are still occasions when the partCrewManifest is reset and removed seats reappear in the editor.