Add support for non-default package repositories.

* lisp/emacs-lisp/package.el (package-archive-base): Var deleted.
(package-archives): New variable.
(package-archive-contents): Doc fix.
(package-load-descriptor): Do nothing if descriptor file is
missing.
(package--write-file-no-coding): New function.
(package-unpack-single): Use it.
(package-archive-id): New function.
(package-download-single, package-download-tar)
(package-menu-view-commentary): Use it.
(package-installed-p): Make second argument optional.
(package-read-all-archive-contents): New function.
(package-initialize): Use it.
(package-read-archive-contents): Add ARCHIVE argument.
(package--add-to-archive-contents): New function.
(package-install): Don't call package-read-archive-contents.
(package--download-one-archive): Store archive file in a
subdirectory of package-user-dir.
(package-menu-execute): Remove spurious line movement.

* lisp/emacs-lisp/package.el (package-load-list, package-archives)
(package-archive-contents, package-user-dir)
(package-directory-list, package--builtins, package-alist)
(package-activated-list, package-obsolete-alist): Mark as risky.

0 files changed, 0 insertions, 0 deletions