[darkroom] Organized more

[sen]

I couldn't find stuff I needed in the dark last time I was using the
darkroom, so today I organized the shelving above the sink a bunch. Each
category now has a label, please make sure the items stay in the section
of the shelf they're supposed to.
I also moved some of the less used tanks into the storage closet (the big
one and all but one of the smaller ones), to keep them out of the way.
 -sen