(cal-menu-holidays-menu): Use calendar-cursor-holidays rather than

(cal-menu-holidays-menu): Use calendar-cursor-holidays rather than
cal-menu-today-holidays.
(cal-menu-today-holidays): Remove function.

(cal-menu-holiday-window-suffix): Simplify.
(cal-menu-list-holidays-year, cal-menu-list-holidays-following-year)
(cal-menu-list-holidays-previous-year, calendar-mouse-goto-date):
Remove unused functions.
(calendar-mouse-view-diary-entries): Use format rather than concat.

(cal-menu-x-popup-menu): Turn it into a macro.
(calendar-mouse-holidays, calendar-mouse-view-diary-entries)
(calendar-mouse-print-dates): Adapt for cal-menu-x-popup-menu change.

(cal-menu-event-to-date): Remove function.
(calendar-mouse-holidays, calendar-mouse-view-diary-entries)
(calendar-mouse-view-other-diary-entries, calendar-mouse-print-dates)
(cal-menu-set-date-title): Use calendar-cursor-to-date rather than
cal-menu-event-to-date.

(calendar-mouse-tex-day, calendar-mouse-tex-week, calendar-mouse-tex-week2)
(calendar-mouse-tex-week-iso, calendar-mouse-tex-week-monday)
(calendar-mouse-tex-filofax-daily, calendar-mouse-tex-filofax-2week)
(calendar-mouse-tex-filofax-week, calendar-mouse-tex-month)
(calendar-mouse-tex-month-landscape, calendar-mouse-tex-year)
(calendar-mouse-tex-filofax-year, calendar-mouse-tex-year-landscape):
Remove functions.
(cal-menu-context-mouse-menu): Replace the above functions with the
cal-tex versions.  Add HTML submenu.