This one's a little involved:
- EMailShellView now obtains a CamelFolder itself in response to
EMFolderTree::folder-selected signals. Uses EActivity to do so.
- Revise EMFolderTree::folder-selected signal arguments to be more
useful: emit a CamelStore object instead of a folder URI.
- Also revise EMFolderTree::folder-activiated signal arguments the
same way while we're at it.
- Remove the "folder_uri" argument from e_mail_reader_set_folder().
If you have a CamelFolder object you can obtain the URI string by
calling camel_folder_get_uri().
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