Updated land_units_tables for patch 6.1.

Changed mod thumbnail to use the unit info card from Partypus for consistency.

Added new unit infopics and unit cards from Partypus, thanks Partypus!

Updated for 6.0.

Updated unit_purchasable_effect_sets_tables to include new Purchasable Effects introduced in 6.0.

Land_units_tables change:
Health: 156 -> 181

Main_units_tables changes:
Campaign cost: 600 -> 650
Upkeep cost: 145 -> 169

Added building_units_allowed entries to see if normal Greenskins factions can recruit the Big Stabbas with the Savage Orcs buildings.

Modified melee_weapons_tables to reduce "Weapon Length" from 8 to 1 for better unit performance (unit will now attempt to surround enemy if possible).

Initial release.