[tor-bugs] #26388 [Core Tor/Tor]: Update tor copyright headers to year 2018

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#26388: Update tor copyright headers to year 2018
-------------------------------------------------+-------------------------
 Reporter:  rl1987                               |          Owner:  rl1987
     Type:  task                                 |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.4.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.3.7
 Severity:  Normal                               |     Resolution:
 Keywords:  fast-fix easy 029-backport           |  Actual Points:
  031-backport 032-backport 033-backport         |
  034-backport                                   |
Parent ID:                                       |         Points:
 Reviewer:  nickm                                |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by nickm):

 This is going to conflict with all the code refactoring stuff I'm working
 on (e.g. #26383).  It's probably best to do this, not as a branch we
 merge, but just by running the tool once the dust settles.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26388#comment:8>
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