Adds/reworks some minibibs

Just some sprite changes/additions (+ 2 simple yaml additions), so i hope it can get into the release.
No code changes, no extra features.

What I did:
I was not really satisfied with the sprites for the depot's minibibs in RA + CNC.
Made em much more subtle, i think it looks better.

Also, fixed the CNC hospital's minibib, and added the minibib for RA's hospital.

CNC's hospital/silo both used mb2x1 and MISS/FIX used mb3x1 earlier.
They each have their own sprites now (mbHOSP, mbSILO, mbMISS, mbFIX).

Thats all.
Compare #4914.


Screenies:
![fix cnc des](https://cloud.githubusercontent.com/assets/1968396/3201973/b60d3624-ed8c-11e3-99ce-590fe3492587.png)
![fix cnc tem](https://cloud.githubusercontent.com/assets/1968396/3201981/bfba9d60-ed8c-11e3-9883-17f68956d079.png)
![fix cnc sno](https://cloud.githubusercontent.com/assets/1968396/3201988/c6d6fdaa-ed8c-11e3-827a-4f6d1b234f66.png)
![hospital](https://cloud.githubusercontent.com/assets/1968396/3201990/d13cf2d6-ed8c-11e3-8f6a-2cc3e5047a05.png)
![ra hosp tem new](https://cloud.githubusercontent.com/assets/1968396/3201991/d3c39f64-ed8c-11e3-86f0-a6bd80158ae4.PNG)
![fix ra tem](https://cloud.githubusercontent.com/assets/1968396/3202002/e5b7c704-ed8c-11e3-8d12-a23b7ac8f0ed.png)

![fix ra int](https://cloud.githubusercontent.com/assets/1968396/3202048/2dec2588-ed8d-11e3-8545-75bb13e1859c.png)