version sort suggestion

[Ed Morton]

I often see people posting question on forums such as StackOverflow 
asking about sorting data by version numbers, e.g. 
https://stackoverflow.com/q/70972516/1745001. Currently I always 
recommend people use GNU sort for it's `-V` option to sort by version 
outside of awk before/after/during processing but it'd be useful if 
sorting by version was one of the options for "sorted_in", e.g. 
@ind_ver_asc, @val_ver_asc, etc. so people don't have to code that 
functionality themselves or rely on calling GNU sort for it.

    Ed.