* API change: changed arguments for Ccp4.setup()
* added Binner class for analyzing reflections in resolution bins
* added support for neutron scattering in gemmi-sfcalc and the library
* new functions: seitz_to_op, normalize_grid, Grid.get_subarray, Grid.set_subarray
* minor improvements in programs mtz2cif, cif2mtz, map
* fix: CIF tags are now case insensitive
* changes in preparing topology accounting for changes in Refmac and CCP4 monomer library