OPNSense/src a3755e8contrib/tzdata theory.html NEWS

Import tzdata 2019a.

Approved by:    so
Security:       FreeBSD-EN-19:08.tzdata
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+62-29contrib/tzdata/theory.html
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+10-1contrib/tzdata/northamerica
+6-4contrib/tzdata/africa
+4-4contrib/tzdata/leap-seconds.list
+3-3contrib/tzdata/leapseconds
+2-2contrib/tzdata/europe
+2-2contrib/tzdata/backzone
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+2-1contrib/tzdata/backward
+1-1contrib/tzdata/version
+0-1contrib/tzdata/etcetera
+203-6514 files

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