Add an "ignore fuel up" feature

[MD1032]

I would like a feature where I can have Fuelly "ignore" a fuel up, that is, document the mileage and gas usage, but not include them in any calculations or statistics. This would be useful in instances where, say, I did some maintenance on my car (say you revved the engine to clean something out, or idled it for 10-15 minutes, or reset the ECU) and did not feel that the tank represented normal conditions, or where I forgot to write down the mileage but remembered approximately what it was and wanted it written down for archival purposes. This would be similar to partial fuel ups, but it would be able to be activated on a fuel-up by fuel-up basis, whereas I believe with the current system, the "partial fuel up" ties the next fill-up to it.

The downside to having a feature like this is that it might skew statistics because people would use it to flag their "poor mileage" fuel ups where they drove like a bat out of hell.

By the way, this is an absolutely awesome website, and I love it so much. I'm a huge fan of how simple and easy it is to use (I use the "mobile" version on my phone), and I think everyone should use it. Period.