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  Name:     alen() - get length of array without undefined elements
  Usage:    <integer> = alen(<array>)
  Params:   array <array> - the array to check
  Returns:  integer equal to the length of the array not including
            elements that are undefined

 ---------------------------------- Example ---------------------------------

                 declare MYarray[10]
                 ? alen(Myarray)          && prints 0
                 ? len(MYarray)           && prints 10

                 MYarray[1] = "alen() test"
                 ? alen(MYarray)          && now prints 1
                 ? len(MYarray)           && still prints 10