Fix several Package Menu and Finder bugs.
* finder.el: Load finder-inf using `require'. (finder-list-matches): Sorting by status is now the default. (finder-compile-keywords): Simpify printing. * emacs-lisp/package.el (package--read-archive-file): Just use `read', to avoid copying an additional string. (package-menu-mode): Set header-line-format here. (package-menu-refresh, package-menu-revert): Signal an error if not in the Package Menu. (package-menu-package-list): New var. (package--generate-package-list): Operate on the current buffer; don't assume that it is *Packages*, since the user may rename it. Allow persistent package listings and sort keys using package-menu-package-list and package-menu-package-sort-key. (package-menu--version-predicate): Fix version calculation. (package-menu-sort-by-column): Don't select the window. (package--list-packages): Create the *Packages* buffer. Set package-menu-package-list-key. (list-packages): Sorting by status is now the default. (package-buffer-info): Use match-string-no-properties. (define-package): Add a &rest argument for future proofing, but don't use it yet. (package-install-from-buffer, package-install-buffer-internal): Merged into a single function, package-install-from-buffer. (package-install-file): Caller changed. Also, fix headers for hfy-cmap.el and ps-print.el.
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