Scripts/Ulduar: Exclude Ignis' main target from the Slag Pot target selector

Closes #10516
Scripts/ScarletMonastery: Summon the Headless Horseman once the Call the Headless Horseman is quest complete

By @cr4st
Closes #13273
DB/Creature: Fix 2 startup errors
Core/AHBot: Filter out from AHBot items that can't be looted
DB/Achievement: Fix map conditions for achievement "He's not getting any older"

25m used to be awarded in 10m vice-versa
DB/Misc: Hellfire Peninsula Pathing

By @Kittnz
DB/Quest: Sniffing Out the Perpetrator (Horde Only)

Script http://www.wowhead.com/quest=12910/sniffing-out-the-perpetrator

Unfortunately I have no data for alliance version of this quest, the usual evade issues occur here ie periodic aura which spawns dwarfs been removed on evade,
Scripts/Ulduar: Fix Ignis' golems not shattering in 25m

Closes #10519
DB/Pathing: Mattie Alred

By @Kittnz
DB/Misc: Fix 2 startup errors
Update 2014_10_24_00_world.sql

I am sleepy....
DB/SAI: Added SAI for first part of mobs before the gunship battle
I will add more when I will have more time.