Refactored RA for nonglobal logging# Please enter the commit message for your changes. Lines starting

Added combined X509MixMatchAuthenticator, which allows for logging in both clients with hostname cert and with client name cert

- and added poll_time parameter to receiver section in README (which has already existed but was not documented)

Fixed first client's access without id (IndexError: tuple index out of range) (thanks to Radko Krkos)

getEvents - id<=0 now resets server's notion of client's id to last N events (and starts sending there)