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The `density` class: handling electron microscopy density data

The `density` class stores all information from an electron microscopy density map file. Protein models can then be docked to this density (using density.grid_search()) to improve their quality.

Subsections

- density() — create a new density map
- density.resolution — Map resolution
- density.sigma_factor — Sigma factor
- density.voxel_size — Map voxel size
- density.px — Origin of the map
- density.py — Origin of the map
- density.pz — Origin of the map
- density.grid — Density values
- density.read() — read an EM (electron microscopy) density map file
- density.grid_search() — dock a structure into an EM (electron microscopy) density map