Fix uvp_noise_error() for interleaved LSTs

[jsdillon]

The documentation of utils.uvp_noise_error() suggest that if "power spectra were computed from interleaved times then the supplied auto_Tsys should include all of the times that are present in all of the pairs." For interleaved power spectra, that the number of times in auto_Tsys (a UVData object) might be double (or more, for more interleaves) the number of times in uvp.lst_avg_array.

This creates a problem in the line

Tsys = interp1d(lsts[~Tflag], Tsys[~Tflag], kind='nearest', bounds_error=False, fill_value='extrapolate')(lst_avg)

because lsts is calculated as

lst_indices = np.unique(auto_Tsys.lst_array, return_index=True)[1]
lsts = auto_Tsys.lst_array[sorted(lst_indices)]

while Tflag has a shape determined by the number of times in uvp.time_1_array and uvp.time_2_array. When that number of times don't match, this causes an error in lsts[~Tflag] because Tflag is half the length of lsts (for example).

This PR fixes that bug by ensuring that the range of lsts indexed into by ~Tflag is the precise right shape.

@Kai-FengChen can you review this PR? Also, @aewallwi just wanted to give you a heads up since this might impinge on your work.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (bd65cd8) 95.99% compared to head (9f71ded) 95.99%.

Additional details and impacted files

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