New anti-pvp-grief features for 1.9, new console command.
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** 14.5 Updates **
* Freshly spawned players are now protected from lingering potion damage in PvP rules worlds.
* Players are now protected from lingering potion damage in PvP safe zones (by default, includes all land claims in PvP rules worlds).
* Added a /DeleteAllClaimsInWorld <world> command, which can only be executed from the server console. Handy when you regenerate one world and not the rest (players get their claim blocks back).