vera-mode.el (vera-mode): Fix `commend-end-skip' setting.

vera-mode.el (vera-mode): Fix `commend-end-skip' setting.
(vera-font-lock-match-item): Fix doc string.
(vera-in-comment-p): Remove unused function.
(vera-skip-forward-literal,vera-skip-backward-literal): Improve code,
use `syntax-ppss'.
(vera-forward-syntactic-ws): Fix argument order.
(vera-prepare-search): Use `with-syntax-table'.
(vera-indent-line): Fix doc string.
(vera-electric-tab): Fix doc string.
(vera-expand-abbrev): Define alias instead of using `fset'.
(vera-comment-uncomment-region): Use `comment-start-skip'.