modflowpy / flopy / 1807

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bug(HOBS): Relax HOBs mlay Sum Criteria (#531)

Due to binary representation of base-10 floats in Python, an error was sometimes raised when reading in an HOB with multilayer observations. The sum of the layer contributions must equal 1; however, the sum could be calculated as 0.9999999 and the error would still be raised. This relaxes the criteria for the sum of layer contributions from multi-layer HOBs to, 0.99999 < sum < 1.00001. It also changes the error message to include the observation name where the error occurred. Added pass and failure tests for criteria to autotest. Pass test uses prs that were found to be problematic under original criteria.

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