The symbol separator cannot be escaped when parsing symbols

[porcuquine]

Trying to read a symbol containing a dot fails.

lurk-user> 'a.b

This should yield the symbol .lurk-user.a.b — which should print as a.b from the lurk-user package.

Some more test cases:

lurk-user> '.a.b

should read as .a.b (absolute rather than relative).

And the dot should be escapable, so

lurk-user> 'a\.b

reads as |a.b|.

[wwared]

The relative package issue is similar to what I mentioned in this comment, about unknown packages returning an error: #422 (comment)

However the problem with a\.b not parsing correctly seems to be a different issue. I think that's still an issue