In this update I added the potion to the shops:

-/adminshop addPotion <shopname> <potionType> <potionEffect> <extended/upgraded/none> <slot> <amount> <sellprice> <buyprice>

-/playershop addPotion <shopname> <potionType> <potionEffect> <extended/upgraded/none> <slot> <amount> <sellprice> <buyprice>

Extended means short or long duration.
Upgraded means potion effect lvl like regeneration/regeneration II.
Just write extended, upgraded or none in this parameter.

All PotionEffects are available:
night_vision, invisibility, jump, fire_resistance, speed, slowness, water_breathing, turtle_master (slowness & resistance), instant_heal,
instant_damage, poison, regen, strength, weakness, luck, slow_falling

Bugfix:
- If player deleted plugin data without deleting the Ultimate_Plugin ordner, they could not join any job or set any home.