Inventory and debug fixes

One case of tidying and two fixes.
The fixes:
- Currently seeing the wrong stats during debug play:
![screen003](https://f.cloud.github.com/assets/1824834/1891498/6fc359bc-7a3e-11e3-89ab-f323b83692ab.png)

- Would be convenient if the inventory button still reset TUs even when there is no inventory screen displayable while debugging.