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'chooseCRANmirror()' and 'chooseBioCmirror()' now offer HTTPS mirrors in preference to HTTP mirrors. This changes the intepretation of their 'ind' arguments: see their help pages.
'ttkimage()' did not (and could not) work so was removed. Ditto for 'tkimage.cget()' and 'tkimage.configure()'. Added two Ttk widgets and missing subcommands for Tk's 'image' command: 'ttkscale()', 'ttkspinbox()', 'tkimage.delete()', 'tkimage.height()', 'tkimage.inuse()', 'tkimage.type()', 'tkimage.types()', 'tkimage.width()'. (PR#15372, PR#16450)