[tz] [PROPOSED] "m" now abbreviates both "maximum" and "minimum"

[Stephen Colebourne]

>    # Abbreviate "max", "min", "only" and month names.
> +  # Although "max" and "min" can both be abbreviated to just "m",
> +  # use the longer forms "ma" and "mi" for now,
> +  # for compatibility with zic 2023d and earlier.
>    gsub(/ max /, " ma ", line)
>    gsub(/ min /, " mi ", line)
>    gsub(/ only /, " o ", line)

Maybe I'm missing some context, but how can "m" or "mi" possibly be
better than "max" in a human-readable source code file?

Stephen