Add damage received to @dpm command

I'm currently learning how to manage my HP effectively to stay within the range for Berserk. I'd like to measure the damage taken to help optimize my pot usage, for example Honsters vs Barbarian potions while training at himes.

It would be handy to supplement the current @dpm command with the stats on damage received. It's not exactly 1:1 with pot usage because of HP triggers, but it would be interesting to look at. The alternative is to set a timer and count the pots before/after, but raw values could help with understanding constant vs fixed % pots at different mobs.

This would also work as a command separate from @dpm, but I can't think of a good short name.