Plus a few very minor prettifications.

Testcases 062.

Associated test cases in 040.

Let lic accept number with comma instead of a period (in addition
to those with a period). Implementation idea: if a token is not a
number, try to replace a comma with a dot (s/,/./g in Perl terms)
and re-read the result; if it is a number, use that.

Resolves #38.

Vector literal syntax shall be like CL's; table literals #:(<pairs>).

Unifying the character literal code with the string escape code
does not really offer itself, so it is postposned for now. The
switch to CL character literal syntax is now considered complete.
Resolves #36.

More unification with string parsing *maybe* advised.

New code may need some polishing and refactoring, though.

The problem turned out to be a general problem reading things that
begin with a dot, because more than one rune was pushed back in
that case. Reader now has a stack of unread runes instead of just
one. Resolves #35.

SBCL complained about package SYS not being defined -- a | | pair
around the sys:stdin symbol in the lic branch of the compat part
cured that.

This makes (read) et al. always use the input line editor if stdin
is a terminal. Resolves #33.

There should not ever be a nil prompt field in the port{} struct,
so it would actually be better to fix that instead of checking on
nil.

This means we have the input line editor avaibale for (read) etc.
on stdin without any special code.

In the course moved odep/odep.go to lob/dependencies, causing myriads
of changes everywhere.

The latter, which evaluates the place only once, is modeled after the
one from SBCL; I haven't seen its source, but its expansions.