(bookmark-make-cell-function, bookmark-search-size)

(bookmark-make-cell-function, bookmark-search-size)
(bookmark-current-bookmark): Declare variables for compiler.
(bookmark-buffer-file-name, bookmark-get-filename)
(bookmark-get-front-context-string)
(bookmark-get-rear-context-string, bookmark-get-position)
(bookmark-get-info-node, bookmark-file-or-variation-thereof)
(bookmark-jump-noselect): Declare functions for compiler.
(Info-bookmark-make-cell): Fix argument list to match example of
`bookmark-make-cell-for-text-file'.
(Info-bookmark-jump): Don't require info inside info.el.