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Counts iterations of apr_loop[x] and returns current iteration number.
Two optional variables: loop and start.
loop may be specified as 'apr_loop[x]' or 'loop[x]'. If no loop specified,
defaults to 'apr_loop'.
if displaying records in batches of 50, on the second page one might
specify [apr_loopctr start="51"].) If no start specified, defaults to 1.