Updated land_units_tables for patch 6.1.

Added min-spec portrait for Harpies.

Updated for 6.0 with AR unit type in land_units_tables.

Updated cdir_military_generator_unit_qualities_tables for 5.2.

Updated building chains tables to 5.1.

Forsaken Berserkers recruitment time 1 -> 2 turns

Added Marauder Berserkers back to Barracks level 2.

Forsaken, renamed to Forsaken Berserkers, and moved to Barracks level 3 with the following changes:
Unit size 80 -> 100
Recruitment cost 750 -> 1075
Upkeep cost 188 -> 263
Leadership 70 -> 80
Melee attack 30 -> 35
Gains the Berserk ability
Bonus health 84 -> 94

Updated for 5.0. Main units and land units tables updated.

Added custom historical text entry for Centigor (Great Weapons) to resolve a crash issue.

Thanks genesis999!

Added new units to Wintertooth on faction re-emergence due to rebellion.

Added unique model for Awakened Trolls. Adjusted the unit's following stats:
Recruitment cost 900 -> 1100
Creation time 1 turn -> 2 turns
HP 486 -> 608
Armour 90 -> 80
Leadership 55 -> 60
Melee attack 34 -> 40
Melee defence 36 -> 45
Charge bonus 20 -> 24
They are essentially Troll Aspiring Champions for Wintertooth now.