Added a custom tag to display a link to a profile. Refactored the avatar tag to optionally display a profile link around the image. Removed the width and height attributes from the avatar image tag. I think this was causing disk hits whenever those properties were not cached. The avatar tag is now an inclusion tag.

{% load url from future %}
{% load bio_tags %}
{% if avatar_url %}
<a href="{% url 'bio-view_profile' username=user.name %}">
<img src="{{ avatar_url }}" alt="{{ user.name }}" style="float:left;margin-right:3px;" /></a>
{% endif %}
{% profile_link user.name %}:<br />
{{ user.message|safe }}