Fixed claims with subdivisions living on as ghosts.

Claims like this, when deleted, would still protect the area for any
players who have that claim cached.  This change seems to have fixed the
issue.
Added /gpreload.

Reloads configuration settings, but doesn't totally restart the plugin.
If the server owner has updated the JAR, then either /reload or server
reboot is still necessary.
Version to 8.7