Martin and I had been working towards the idea that ImageSegments should
never create non-Canonical symbols, and the user should not have to use
manual techniques to preserve symbols they are interested in keeping alive.

I ended up getting stuck however, in trying to discover what process
ImageSegment
goes through while it is installing objects - ImageSegment #install �has a
call to an
unimplemented method � #readFromFileWithSymbols �which it seems it should be
using, but isn't....(wha' the?)