Fix integer/float issues
Less fat zombies
In the advanced inventory, recognize when the player is not grabbing anything.

This is particularly troublesome in the following scenario:
* grab something (a shopping cart)
* Enter AIM
* Assign a pane to be [D]
* Exit the AIM
* Release the cart
* Enter AIM
* You can't easily switch slot on the pane assigned to be the [D]
floor selected_row/column
+ )
Adds FCOS+2 to trader_avoid

Prevents Flaming Chunk of Steel +2 (debug-only item) from being spawned
into NPC's inventory.
Adds antiparasitic drug.

Treats dermatik infestation. Rather uncommon, and not healthy at all.
Also re-adds antifungal medication spawns that got lost in recent
merges.
Spawns.
Merge Adv inventory pane management fix.
Merge reduction in spawn rate for fat zombies.
Comma

oops
Tabs

double oops
Merge pull request #5895 from Rivet-the-Zombie/antiparasitic

Adds antiparasitic drug.
Adds eye drops, saline solution.

Both can be used to clean boomer puke out of your eyes.
Saline is also craftable via booked recipe and can be used in some
crafting recipes.
Merge pull request #5896 from 9600bauds/avoid

Adds FCOS+2 to trader_avoid.
modulus adjustment
Merge pull request #5897 from Rivet-the-Zombie/eyedrops

Adds eye drops, saline solution.
TABPOCALYPSE\!
Fixed issue at it's root
Doubles charges-per-volume of ammonia and bleach.

As with a few PRs before, using 250 mL per 'dose' is a lot of chemical
at once.