Computation times

00:00.299 total execution time for 6 files from examples/EM:

Example	Time	Mem (MB)
Resistive heating (em_resistive_heating.py)	00:00.124	0.0
Resistive heating 2D multiple-connect isopotential (em_resistive_heating_2d_multi_isopots.py)	00:00.041	0.0
Resistive heating 2D connect isopotential (em_resistive_heating_2d_isopots.py)	00:00.039	0.0
Resistive heating 2D (em_resistive_heating_2d.py)	00:00.033	0.0
RLC circuit by isopotential (em_rlc_isopotential.py)	00:00.031	0.0
RLC circuit by function (em_rlc_define_func.py)	00:00.030	0.0