* epg.el (epg-invalid-recipients-reason-alist): Renamed.

* epg.el (epg-invalid-recipients-reason-alist): Renamed.
(epg-delete-problem-reason-alist): Renamed.
(epg-import-ok-reason-alist): New constant.
(epg-import-problem-reason-alist): New constant.
(epg-status-IMPORTED): New function.
(epg-status-IMPORT_OK): New function.
(epg-status-IMPORT_PROBLEM): New function.
(epg-start-import-keys): Don't use a temporary output file.
(epg-start-receive-keys): New function.
(epg-import-keys-from-server): New function.
(epg-receive-keys): Alias to epg-import-keys-from-server.