Mercury questions

Mercury answers

• implementation of using Maclaurin series of e^x in python
• Get coordinates of quiver arrow (tip and bottom) when plotting in 'uv' mode
• Why does a nested loop perform much faster than the flattened one?
• Untyped global name 'sum_': cannot determine Numba type of <class 'function'>
• Faster code to calculate distance between points in numpy array with cyclic (periodic) boundary conditions