Spreadsheet data path structure should be used to position data within spreadsheet

Currently the path/item structure utilized in the spreadsheet writer means that the paths themselves do not control very well where the data will be written to.  For example, if we have a path structure as such:
{0}
{2}
{3}

the data will still be written to the first three rows of the spreadsheet.  The path {2} does not mean that it will skip row '1' and write it to row '2.'
