Implement random_position and calc_min_distance
Add OFMD FFT test
Use ewald() in forces
Implement FCC lattice
Read OFMD.input, use FCC
Ewald energy works
Make it compile
Implement fred2fcart()
Implement direct_sum()
Add forces
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Add ewald2() function from ABINIT
Test direct sum, polish
Add test_ewald2()
Calculate stress
Implement sred2scart()
Test stress tensor in FCC as well
Implement ewald_box()
Add test_ewald3.f90
Add another test case