* Correctly handle verification of signatures without t=
(timestamp) and with x= (expiration); both are optional
* Fix error in validate_signature_fields which prevented
signature expiration from being properly evaluated
* Correct ARC signing for AR headers with authres-version
or comments before resinfo
* Correct line separtor after AAR header field
* Correct signature in ARC-Seal on LF as linesep
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-dkimpy?expand=0&rev=17
