[chaley]

Code submitted.

There is now a template function 'count'. It takes one argument, the character that separates the items in the list. Most lists use comma, but authors uses ampersand.

Examples:
tags: {tags:count(,)}
authors: {authors:count(&)}
a custom multiple field: {#mymult:count(,)}

As another example, imagine that you have a custom field #genre that you use for hierarchical tagging. This would be a text (non-multiple) field containing things like
Science:Biology:Plankton
Fiction:Mystery:Crime:Police
You can count these via
{#genre:count(:)}