• Updated to 0.9.13
• Sorted USES/OPTION section to better comply with PHB
• Removed custom etcdir and changed to ETCDIR, added note in UPDATING

Changelog: https://guacamole.incubator.apache.org/releases/0.9.13-incubating

Reviewed by: matthew (mentor), mat
Approved by: matthew (mentor)
Differential Revision: https://reviews.freebsd.org/D11817