Control decimal places in the Resource Planner areas

Seeing something like "4.682" is bit too much detail to show on a screen for long-range forecasting (where accuracy is less than you'd expect in, say, the Resource Scheduling screen).

Let users choose their DP, and have a smaller DP as the default.

edit: this is also an issue on the Resource Budgeting screens on the Business Case. It's quite a few clicks to get PMs into the grid here, and when they do put figures on, they sometimes see these figures afterwards with 3 DPs - which just feels weird when you've only put in budgeted hours!