(calendar-french-epoch): Rename french-calendar-epoch. Update callers.

(calendar-french-epoch): Rename french-calendar-epoch.  Update callers.
(calendar-french-month-name-array): Rename variable and function
french-calendar-month-name-array.  Update callers.
(calendar-french-multibyte-month-name-array): Rename
french-calendar-multibyte-month-name-array.  Update callers.
(calendar-french-day-name-array): Rename variable and function
french-calendar-day-name-array.  Update callers.
(calendar-french-special-days-array): Rename variable and function
french-calendar-special-days-array.  Update callers.
(calendar-french-multibyte-special-days-array): Rename
french-calendar-multibyte-special-days-array.  Update callers.
(calendar-french-accents-p): Rename french-calendar-accents.  Update callers.
(calendar-french-leap-year-p): Rename french-calendar-leap-year-p.
Update callers.
(calendar-french-last-day-of-month): Rename french-calendar-last-day-of-month.
Update callers.
(calendar-french-to-absolute): Rename calendar-absolute-from-french.
Keep old name as alias, update callers.
(calendar-french-print-date): Rename calendar-print-french-date.
Keep old name as alias, update callers.
(calendar-french-goto-date): Rename calendar-goto-french-date.
Keep old name as alias.