gemmi-map: small changes to the output formatting
gemmi-map: small changes to the output formatting

Maps from EDS are fine. There are still minor differences, e.g for 5vkc:
Symmetry-equivalent values differ: -0.101129 != -0.117984  diff: 0.0168549
but it's because the values are discretized.
The same map produces with CCP4 fft has max. diff. for symmetry
equivalent points 7.15256e-06

project-gemmi/gemmi,project-gemmi/gemmi,project-gemmi/gemmi,project-gemmi/gemmi