Make PLUGINS_DIR absolute, this is the common requirement in Kanboard.
Make PLUGINS_DIR absolute, this is the common requirement in Kanboard.

Also add comment telling users to use absolute paths to avoid someone
else failing the same way as I did.

fguillot/kanboard,kanboard/kanboard,fguillot/kanboard,kanboard/kanboard,BlueTeck/kanboard,renothing/kanboard,fguillot/kanboard,kanboard/kanboard,libin/kanboard,libin/kanboard,BlueTeck/kanboard,renothing/kanboard,BlueTeck/kanboard,renothing/kanboard