Modified the implementation of the avatar tag to look for an attribute 'user_profile' on the user object. If present, this is assumed to be the profile. This improves the performance of the member list and some forum views.

<div class="side-block">
<div class="side-block-title">
{% block block_title %}{% endblock %}
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<div class="side-block-content">
{% block block_content %}{% endblock %}
</div>
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