Release 18.1.0

Dedicated release for HLT to be used at Point1.

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Other comments:
Release to be used mainly by HLT.
Simulation is broken https://its.cern.ch/jira/browse/ATLASSIM-243
Due to the new eformat 5 issues are expected with 64b/32b event numbers.
Hence it is _not_ planned to distribute that release on the Grid/CVMFs.
It is installed on AFS in releases area and down at Point1.
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