Restore (with tweaks) instal.el and Makefile

Adjusted for new definition of selected packages

Makefile

@@ -0,0 +1,6 @@
+.PHONY: default install
+
+default: install
+
+install:
+	emacs --script install.el --kill

install.el

@@ -0,0 +1,10 @@
+;;; install.el -- Handle installing selected packages -*- lexical-binding: t -*-
+;;; Commentary:
+;;; Code:
+;; Configure packages archives with priority
+(load-file (locate-user-emacs-file "init.el"))
+(package-refresh-contents)
+(package-install-selected-packages t)
+(package-autoremove)
+(provide 'install)
+;;; install.el ends here