Missing antennas error message

[mkolopanis]

I've been running into this error in a script lately, and without having a REPL to attach to it's basically impossible to diagnose for me. I was thinking maybe we should list the antennas which are not in the antenna_numbers array

pyuvdata/pyuvdata/uvdata/uvdata.py

Lines 3361 to 3364 in 1603109

	if not set(np.unique(self.ant_1_array)).issubset(self.antenna_numbers):
	raise ValueError("All antennas in ant_1_array must be in antenna_numbers.")
	if not set(np.unique(self.ant_2_array)).issubset(self.antenna_numbers):
	raise ValueError("All antennas in ant_2_array must be in antenna_numbers.")