INI: Added method to get string list with empty values
    
    The original implementation was compressing the list,
    throwing away empty strings.
    The function that did that was pretty brain damaging.
    I cleaned it up and adjusted so that it could return
    list with empty values and without them.
    The old function was turned into a wrapper and a new
    high level function was intorduced to provide
    ability to get both empty and non empty strings.