(diary-file, diary-file-name-prefix)

(diary-file, diary-file-name-prefix)
(european-calendar-style, diary-date-forms)
(calendar-day-name-array, calendar-month-name-array): Doc change.
(generate-calendar-month): Adapt for new behaviour of
`calendar-day-name' function.
(calendar-abbrev-length, calendar-day-abbrev-array)
(calendar-month-abbrev-array): New variables.
(calendar-abbrev-construct): New function.
(calendar-day-name, calendar-month-name): Use new abbrev arrays,
rather than fixing abbrevs at some width.  Calling syntax change.
(calendar-make-alist): Use abbrev arrays.  Calling syntax change.
(calendar-date-string): Adapt for new behaviours of
`calendar-day-name' and `calendar-month-name' functions.