(newline): Simplify use of prefix-numeric-value.

(newline): Simplify use of prefix-numeric-value.
(line-move-partial): Remove unused var `ppos'.
(line-move-1): Replace 9999 with most-positive-fixnum.
(move-end-of-line): Use more efficient single-property search.
(move-beginning-of-line): Remove unused var `start'.
(blink-matching-open): Restructure in a more functional style.