Need to document both here and in the dalehenrich:ston repository that transient symbol lists are in use for .stone scripts

[dalehenrich]

See this comment and the bug for more details

I think that it's worth considering removing the transient symbol list before calling the #doit method ... Just about everything of interest is on the stack at this point so I'm not sure that the transient symbol list is serving any purpose once execution of the #doit starts ...