[tz] Historical discrepancies for Italy.

[Michael Deckers]

   Thanks for the patch proposed on 2016-10-24 05:53
   to the Rules for Italy.

   I am still puzzled by some disagreements in the sources
   for 1944, and I will look further into it.

   A tiny bit could be mended in Europe/Rome:

   The source
      [http://www.ac-ilsestante.it/MERIDIANE/ora_legale
       /ORA_LEGALE_ESTIVA_IN_ITALIA.htm]
   quotes a law of 1893-08-10:
     Art. 1
     Il servizio delle strade ferrate in tutto il Regno d'Italia verrà
     regolato secondo il tempo solare medio del meridiano situato a 15 gradi
     all’Est di Greenwich, che si denominerà tempo dell’Europa Centrale.
       [The railway service in the whole kingdom of Italy will be regulated
        according to mean solar time of the meridian placed 15 degrees east
        of Greenwich, which will be called central European time.]
     Art. 2
       [Time of day to be counted from midnight to midnight
        for railway purposes,]
     Art. 3
     Le disposizioni precedenti entreranno in vigore nell'istante in cui,
     secondo il tempo specificato all’art. 1°, incomincerà il 1°
     Novembre 1893, e da quell’istante cesserà di avere vigore qualunque
     altra disposizione contraria.
        [The preceding dispositions will enter into force at the instant
         at which, according to the time specified in the 1st article,
         the 1st of November 1893 will begin, and from this instant any
         other contrary dispositions will end to be in force.]
    This implies that the step in Europe/Rome near 1893-11-01 was planned
    as a jump from 23:49:56 h to 00 h, not as a jump from 00 h to 00:10:04 h.
    Thus:
       -     0:49:56 -       RMT     1893 Nov  1    0:00s     # Rome Mean
       +     0:49:56 -       RMT     1893 Oct 31   23:49:56s  # Rome Mean

    Michael Deckers.