Fix/median performance #20
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This pull request tackles a serious performance issue caused by sorting the complete
xin the newmedian-function.This increases the computation time unnecessarily because efficient algorithms exist that rely only on targeted sorting.
For the ordinary median,
np.medianis used for simplicity.For even sample size, the low and high median can also be acquired by targeted sorting using
np.partition.Besides, a tiny test is added to cover all different combinations that
mediancould encounter.