Get long package description for installed packages from installed files
* doc/lispref/package.texi (Archive Web Server): New; document web server interface. * lisp/emacs-lisp/package.el (package--get-description): New; get long description from installed files. (describe-package-1): Use it, improve comments. No longer writing NAME-readme.txt. * test/lisp/emacs-lisp/package-tests.el: (package-test-describe-package): There is now a description for an installed package. (package-test-describe-installed-multi-file-package): New test.
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