Temporary rename.

engineering/*COMMON/devices/neutron-chopper/placeholder.txt

...ing/*COMMON/devices/odh-detection-systems/placeholder.txt

.../*COMMON/devices/personnel-safety-systems/placeholder.txt

engineering/*COMMON/devices/power-convertors/placeholder.txt

...OMMON/devices/proton-beam-instrumentation/placeholder.txt

engineering/*COMMON/devices/rf-systems/placeholder.txt

...MMON/devices/sample-environment-equipment/placeholder.txt

...COMMON/devices/sample-environment-systems/placeholder.txt

engineering/*COMMON/devices/timing-system/placeholder.txt

engineering/*COMMON/devices/vacuum/placeholder.txt

engineering/*COMMON/devices/water-cooling/placeholder.txt

engineering/*COMMON/utilities/placeholder.txt