Revert "add time_atol to UVFlag.to_waterfall"
Revert "add time_atol to UVFlag.to_waterfall"

This reverts commit 7deeac3d9a1d6f80b0527be6b8d8f9c6042b62a2.

HERA-Team/pyuvdata,HERA-Team/pyuvdata,HERA-Team/pyuvdata,HERA-Team/pyuvdata