Externals Update, 21.2 branch (2019.01.30.)
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Updated all projects to use atlasexternals-1.0.47. This is mainly to fix build issues in the analysis releases on Ubuntu and macOS.
The full list of changes is: atlasexternals@1.0.45...1.0.47
The updates should not affect the build of AthDerivation, only that of the analysis releases. (Unless I messed something up.