(compilation-error-regexp-alist): Add regexp for Lucid lcc.

(compilation-error-regexp-alist): Add regexp for Lucid lcc.
Element lists can now contain a 4th elt giving subexpr for the column.
(next-error): Handle error records with column numbers.
(compilation-parse-errors): Parse column numbers when the alist elt
specifies it.  Use string-to-int instead of read for numbers from buffer
text.