* packages/csv-mode/csv-mode.el: Minor installation cleanups.
Fix up copyright notice. Set version.
(csv-separators, csv-field-quotes): Fix calls to `error'.
(csv-mode-line-help-echo, csv-mode-line-format): Replace mode-line-format
for default-mode-line-format.
(csv-mode-map): Declare and initialize.
(csv-mode): Add autoload cookie.
(csv-set-comment-start): Make sure vars are made buffer-local.
(csv-field-index-mode, csv-field-index): Use derived-mode-p.
(csv-align-fields): Improve insertion types of overlay's markers.