* stick_round_nub for COLLADA export
* UTF-8 in feedback
* display_scale_factor (ported from Incentive PyMOL)
* dx map import: support "type float" and skewed delta
* Python 3.7 support (https://sf.net/p/pymol/bugs/197/)
* enable align with alt-codes
- allow matching of non-alt-code to alt-code atoms in alignments
- swap sorting priority of 'name' and 'alt' identifiers
- sort empty 'alt' before non-empty 'alt'
* flags 6 and 7 for protein and nucleic acid
* mmCIF: read _atom_site.pdbx_formal_charge
* improve coordinate loading from mmcif chem_comp files
- ignore columns with all ? (missing) values
- select columns with "chem_comp_cartn_use" setting
* fix h_add: skip missing coordinates
* mmCIF _atom_sites.fract_transf support (SCALEn equivalent)
* Complete port of scenes to C++
* warn user if setting a setting on the wrong level
* cmd.extendaa: shortcut for cmd.extend with argument auto-completion
* reduced memory footprint of AtomInfoType
* expose "reps" to iterate/alter
* expose "protons" to iterate/alter
* adaptive cartoon quality and sampling, depending on number of atoms
* fix ring center color with cartoon_ring_color=default
* make SelectorGetTmp strictly molecular, fixes for example "dss" with group names
* fix "copy" can cause crash
* fix "custom" selection operator
* consider spec_count in shaders
* don't invalidate shaders for lighting settings
* don't disable shaders for all Intel chips
* don't touch sphere_mode when disabling shaders
* map_new buffer == -1 -> gaussian_resolution
* fix all_states picking
* remove cylinder_shader_ff_workaround and cylinders_shader_filter_faces
* remove unused gl_ambient setting
* fix Tcl/Tk menu settings logging
* fix: grid mode scales down label size incorrectly
* fix: no animate argument for cmd.origin
* fix side_chain_helper for hetatm polymer atoms
* fix .mmd export
* refactor many function to take "const" pointer arguments
