Log Message:
2.8.3           2009/05/31
        Close the configuration file after reading it, plugging a
                descriptor leak.
        Release memory associated with old configuration nodes (i.e. strings)
                as well as the nodes themselves.
        Connect the configuration handle to its allocated data so cleanup can
                actually be thorough.
        Fix an error message reported inside _FFR_REPLACE_RULES.
        Plug a memory leak in mlfi_header() tripped when errors occur.
        Since ADSP has not yet been registered by IANA, adjust its method
                label in Authentication-Results accordingly.
        Include selector, domain and other text if possible when logging
                key retrieval failures.
        Add _FFR_SENDER_HEADERS, allowing user control over which header
                fields are used to make the sign/verify decision and
                perform key selection.
        LIBDKIM: Initialize canon_lastchar in dkim_add_canon().
        LIBDKIM: Clean up any compiled regular expressions in dkim_close().
        LIBDKIM: Fix some type-related compiler warnings.