Add function calc_e_kin_dens
to compute the local kinetic energy density
#95
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This will be needed for when we implement the electron localization function (ELF).
There are in fact several possible definitions of the local kinetic energy density (KED), which should all integrate to the total kinetic energy. The ELF uses a different one to that which I had originally implemented (see docstring in the new function for more info).