init.el: Fix setting of expand-region
init.el: Modify safe-define-key
init.el: Modify code using safe-define-key
init.el: Fix document of define-keys
init.el: Replace define-key with safe-define-key
init.el: Replace global-set-key with global-safe-set-key
init.el: Modify code using smartrep-define-key
init.el: Add key bindings using smartrep-define-key
init.el: Modify color-scheme-colors
init.el: Remove functions and hook from setting of popwin

Remove popwin:set-other-window-scroll-buffer and popwin:close-popup-window.
Merge branch 'develop'