Provide test coverage for the statistics module

[harry093]

• rotation_matrix()
• vcv_cart2local()
• vcv_local2cart2()
• error_ellipse()
• circ_hz_pu()
• k_val95()

[suv27]

I would like to work on this issue. So I can understand a little what you want, Do you want uni test for those specific function for the statistic.py python file.
Can you assign this issue to me, I will work on it?

[BatchelorJ]

Hi @Physsix27, that would be great! Yes we're looking for test coverage for each of these functions added as a new test_statistics.py module in geodepy.tests.

The Dynanet/DynAdjust documentation mentioned in the function docstrings can be found at the following link.

[suv27]

Can you review/merged #84 @harry093 @BatchelorJ