Rationalize calendar handling of day and month abbrev-arrays.
* lisp/calendar/calendar.el (calendar-customized-p): New function. (calendar-abbrev-construct, calendar-make-alist): Change what it does. (calendar-day-name-array, calendar-month-name-array): Doc fix. Add :set function. (calendar-abbrev-length, calendar-day-abbrev-array) (calendar-month-abbrev-array): Make defcustoms, with appropriate :set. (calendar-day-abbrev-array, calendar-month-abbrev-array): Elements may no longer be nil. (calendar-day-name, calendar-month-name): Update for changed nature of abbrev arrays. * calendar/diary-lib.el (diary-name-pattern): Update for changed nature of abbrev arrays. (diary-mark-entries-1): Update calendar-make-alist calls. (diary-font-lock-date-forms): Doc fix for changed abbrev arrays. * calendar/cal-html.el (cal-html-day-abbrev-array): Simply inherit from calendar-day-abbrev-array. * etc/NEWS: Mention this.
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