Round volume measures by specific accuracy

[Mik Firestone]

There is something about being asked to measure 4.531 gallons of sparge water that drives me nuts. My sight glass has an accuracy of a quart. It would be nice to have an option in the equipment window to let me specify the accuracy of my sight glass as X and have brewtarget automatically round the water calculations off to the nearest X. This should work for SI, British and US units of volume.
I think this should be a drop down list. If you are using US or British traditional units, the drop down list will allow you to select none, pints, quarts and gallons. If you are using SI units, it should show none, 100 ml, 500 ml and 1l. Selecting none will produce the same behavior as we have today. The default should be "none".

[Philip (rocketman768)]

If the "accuracy" is quarts for example, you are saying you would like to see something like 18.12 qt instead of 4.531 gal? For metric units, I think this is a non-issue since 17.265 L is just 17 L and 265 mL.