Remove spurious or unnecessary leading stars in docstrings.

Remove spurious or unnecessary leading stars in docstrings.
(tar-header-block-tokenize): Also obey default-file-name-coding-system.
(tar-parse-octal-integer-safe): Use mapc.
(tar-header-block-summarize): Remove unused var `ck'.
(tar-summarize-buffer): Don't clear the modified-p bit if it wasn't
cleared before.  Obey default-enable-multibyte-characters.
Use mapconcat.  Simplify setting of tar-header-offset.
(tar-mode-map): Move initialization inside delcaration.
(tar-flag-deleted): Use `abs'.
(tar-expunge-internal): Remove unused var `line'.
(tar-expunge-internal): Don't hardcode point-min==1.
(tar-expunge): Widen while doing set-buffer-multibyte.
(tar-rename-entry): Use file-name-coding-system.
(tar-alter-one-field): Don't hardcode point-min==1.
(tar-subfile-save-buffer): string-as-unibyte works on unibyte strings.
(tar-pad-to-blocksize): Don't hardcode point-min==1.  Clarify the code.