aura: icon indices start at 1, not 0.
health: Correctly display tapping.

Units can be tapped by multiple players. Also drop out early in the
check if the unit is player controlled.
power: Correctly display tapping.

Units can be tapped by multiple players. Also drop out early in the
check if the unit is player controlled.
tags: Support battle pets' level

Fixes #172
Merge pull request #173 from p3lim/level

tags: Support battle pets' level
totem: Destroy the OnClick handler.

DestroyTotem() is currently protected and there's no easy way to handle
this.

Fixes #168.
TOC: Bump interface version to 50200 (5.2).
TOC: Bump version to 1.6.2.