Make plot min/ max and average of a variable simple

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

---

I want to be able to plot the min, max and average for a variable over time. This has to work for one or more (but not all) blocks, with a dataset such as bake. Please make it simple.

Here are the convoluted steps Ken had to use to get this to work:

This is way harder than it should be, but it is working in 5.0:

1. Select the block you want the plot for. You can over the mouse over the block and hit the b key.
2. Run the "Extract Selection" filter on that block.
3. Open the Find Data dialog.
4. In the first line, choose points or cells (depending on what you want to plot), and "ExtractSelection#".
5. In the first criterium line, select "ID" "is >=" "0"
6. Click "Run Selection Query"
7. Click "Plot Selection Over Time"
8. Apply the filter that is created.

The resulting plot will show the min, max, average, and quartiles of all the variables. Select down to the one you want to see.