tablerow drop does not expose its row property

[jg-rp]

The tablerowloop object available within the tablerow tag should expose a row property, being the current row number of the table.

The documentation for tablerowloop needs updating too.

Example template:

{% tablerow i in (1..5) cols:2 %}
{{ i }} {{ tablerowloop.row }}
{% endtablerow %}

Expected output:

<tr class="row1">\n
<td class="col1">1 1</td>
<td class="col2">2 1</td>
</tr>\n
<tr class="row2">
<td class="col1">3 2</td>
<td class="col2">4 2</td>
</tr>\n
<tr class="row3">
<td class="col1">5 3</td>
</tr>\n