Testing Shower Filter Code - May 12

I changed the code to check all possible combinations of 3 nearest neigbhors (when a shower had >3 neigbors hit) and take the best Trms. This code finds 6 of the 12 showers missed by the original version. The other 6 are showers where only 3 nearest neighbors were hit, and one of those sites also had an accidental very early or late, throwing off the fit.