Comment out the code that writes to sianctapi-hp.log.  It creates a large file on si-taverna that is not being used.  Keep the code around for a while until we figure out if it can be permanently removed.

https://github.com/Smithsonian/sianctapi/blob/02fbbe4b50aecc6cae255214fcf5b09434c97b33/index.php#L106-L122