Provide option to render sortlinks

[greystate]

It would be quite cool if the PaginationHelper was able to handle sorting by specific fields and thus be able to output links to change that, e.g. if I specify sorting on Name and Age fields, I would automatically get links with these options baked in (and ability to reverse-sort as well).

E.g. with a standard call like this:

<xsl:call-template name="PaginateSelection">
    <xsl:with-param name="selection" select="$nodeset" />
    <xsl:with-param name="sortBy" select="'Name DESC'" />
    <xsl:with-param name="renderSortLinks" select="true()" />
</xsl:call-template>

I'd get something like this:

<div class="sortlinks">
    <a href="/path/to/page/?sortdir=asc">Name</a>
</div>
<!-- Paginated output -->
<!-- Pager output -->

(Because the default sort was set to DESC)

and obviously on page 3 I'd get this:

<div class="sortlinks">
    <a href="/path/to/page/?p=3&amp;sortdir=asc">Name</a>
</div>
<!-- Paginated output -->
<!-- Pager output -->

Need to check if there are some standard patterns defined for these types of links...