* Python API: New "auto library mode". Automatically start a
non-GUI PyMOL instance if the pymol.cmd API is used without
running pymol.launch() first
* pdb_echo_tags for mmCIF and MMTF
* command parser: improve exception handling
* fix some PSE export memory leaks
* pymol2.cmd2: eliminate (non-weak) circular references
* movie making: reinterpolate after add_nutate/add_roll etc.
* support "module:callable" in loadfunctions/safefunctions
* yellow state indicator for discrete objects
* mpng modal draw improvements
* fix isosurface all_states rendering
* pdb_hetatm_guess_valences for CIF loading
* mutagenesis wizard: improve "apply" performance
* fix measurement and alignment object partial PSE loading
* some load/save refactoring
* keep atom IDs when creating object from selection
* when renaming group "A" to "B", then also rename entry "A.X" to "B.X"
* ignore SCALEn if CRYST1 is 1x1x1 or invalid
* new/refactored API functions for accessing coordinates and maps as numpy arrays
* new API function: cmd.set_state_order
* Session file (PSE) support for callback objects
* fix/silence many compiler warnings
* fix bg_rgb_top/bg_rgb_bottom side effects
* revert "fix setting surface_circumscribe"
* delete some obsolete files