Fix tar package handling, and clean up package-subdirectory-regexp usage.
* lisp/startup.el (package-subdirectory-regexp): Move from package.el. Omit \\` and \\', and let callers add them. * lisp/emacs-lisp/package.el (package-strip-version) (package-load-all-descriptors): Add \\` and \\' to package-subdirectory-regexp before using it. (package-untar-buffer): New arg DIR; ensure that file untars only into this expected directory. Remove superfluous delete-region. (package-unpack): Caller changed. (package-tar-file-info): Use package-subdirectory-regexp.
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