Potential problems in ``detectors.py`` derived from unused items

[oesteban]

First,

diagnostics-NME/findoutlie/detectors.py

Line 17 in 6653c80

from scipy.stats import norm

where norm is import but unused.

Later

diagnostics-NME/findoutlie/detectors.py

Line 119 in 6653c80

Q2 = np.percentile(measures, 50, interpolation="midpoint")

Q2 is assigned but never used.