* Fixes#3810.
* Partial revert of eae1161.
* Removed the item database bonuses from Throwing Increase HP/SP Potions and moved them back to source as these items require the caster's Base Level.
* Concentrated White Potion Z should only increase HP regeneration rate (not the interval).
* Vitata 500 should increase SP regeneration rate (not the interval).
Thanks to @Everade!