2008-03-04 Marcus Brinkmann <marcus@g10code.de>

• keyring.c: Remove most forward declarations.

(keyring_editor_export): Do not chicken out if there are more keys
selected than one.
(keyring_editor_copy): Likewise.
(toolbar_export_key): Rename to ...
(toolbar_export_keys): ... this.
(keyring_toolbar_new): Use new name here.
(keyring_editor_edit): Make sure a single private key is selected.
(keyring_editor_backup): Likewise.
(keyring_editor_trust): Check for single selection.
(keyring_editor_menubar_new): Make "Send keys..." sensitive only
if there is a single selection.
(keyring_editor_send): Check for single selection.
(keyring_editor_can_sign): Access editor->current_key directly.
Protect against it being NULL.