Non real-life separable parts

[Philippe Hurbain]

I was wondering in the 18-01 library there are some pneumatic parts which are actually subparts of things you shouldn't (can't) be taken apart in the real world.
I noticed this because now I have to filter out parts like 19466c01.dat and 19467c01.dat in my LDCad default pneumatics bin.

Purpose of ~ is to hide parts from casual users, and, among other things, it is used to hide FIXED assemblies components as they shouldn't be used directly. In the cas of moving part assemblies (pneumatics, motors, etc), the user may want to make their own assembly to exactly match their model. Unfortunately not all LDraw editors have sophisticated templates or inlining capabilities