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'read.table()' now always uses the names for a named 'colClasses'
argument (previously names were only used when 'colClasses' was too
short). (In part, wish of PR#16478.)
'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)