[Halld-offline] HDGeant4 bug fix release: 1.5.1

[Mark Ito]

Folks,

As per Richard's recent email

https://mailman.jlab.org/pipermail/halld-offline/2017-November/003011.html ,

I have tagged a built a new release of HDGeant4, version 1.5.1. Find the 
release notes at

https://github.com/JeffersonLab/HDGeant4/releases/tag/1.5.1 .

There are new version.xml files:

https://halldweb.jlab.org/dist/version_2.22.xml

https://halldweb.jlab.org/dist/version_2.22_jlab.xml

The default versions will change at midnight.

   - Mark