Max Health display reset to 10 hearts after respawn

when a player has a maxHealth greater than 20, extra hearts are displayed in the UI. The extra hearts disappear when the player respawns after death, and only logging out/back in will restore them.

This was originally tested using setMaxHealth on a bukkit server and later confirmed on a vanilla 1.6.2 server by editing a player's Base generic.maxHealth value with an nbt editor.