MFC of r180208, r181413, r181418, r181421, r181424

MFC of r180208, r181413, r181418, r181421, r181424

  Set magic fbsd:nokeywords property

  Remove Theory, which isn't part of the zoneinfo module but came out
  of /head/usr.sbin/zic (and isn't installed from there neither).

  MFC of tzdata2008c

  - Africa/Morocco will have DST in 2008.
  - Asia/Choibalsan should be GMT+08:00.
  - Asia/Pakistan will have DST in 2008.

  MFC of tzdata2008d

  - Mauritius will have a DST experiment between 2008-11-01 and 2009-03-31.
  - Add/Fix historical data for C-Eur, the SovietZone, Germany,
    Bahamas, San Luis.
  - Add information about West Para (America/Santarem)
  - America/Eirunepe and America/Rio_Branco go to UTC-4

  MFC on tzdata2008e:

  - Fix dates in 2008/2009 for Africa/Mauritius.
  - Leap second notification for the end of 2008.