bug#61547: [PATCH] calendar.el buffer name variables, use defcustom and change name

[Robert Pluim]

>>>>> On Thu, 16 Feb 2023 07:11:40 +0100, Thuna <thuna.cing@gmail.com> said:
 
    Thuna> -(defconst calendar-buffer "*Calendar*"
    Thuna> -  "Name of the buffer used for the calendar.")
    Thuna> +(defcustom calendar-buffer "*Calendar*"
    Thuna> +  "Name of the buffer used for the calendar."
    Thuna> +  :type 'string
    Thuna> +  :version "30.0.50"
    Thuna> +  :group 'calendar)

    Thuna> I used 30.0.50 as the version number for the `defcustom' and
    Thuna> `make-obsolete-variable' in the patches.  This should be correct but
    Thuna> feel free to change as needed.

:version is the released version in which the defcustom will first
become available, in this case it should be "30.1" (and similarly for
`make-obsolete-variable')

Robert
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