Change in GeoModelG4 to support Ether and HyperUranium handling in new geometry tags.

This merge request fixes issue #5 (closed) and allows compatibility with older geometry file dumps.

added 8 commits

• c5bee4f4...55949460 - 6 commits from branch master
• e9f295c2 - Merge branch 'master' of https://gitlab.cern.ch/GeoModelDev/GeoModel
• c77e8cc5 - Merge branch 'master' of https://gitlab.cern.ch/GeoModelDev/GeoModel

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added 16 commits

• c77e8cc5...59262b07 - 14 commits from branch master
• e9877ea4 - Merge branch 'master' of https://gitlab.cern.ch/GeoModelDev/GeoModel
• 1ac3e064 - Merge branch 'master' of https://gitlab.cern.ch/GeoModelDev/GeoModel

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added 2 commits

• f26f0d90 - 1 commit from branch master
• 617eb639 - Merge branch 'master' of https://gitlab.cern.ch/GeoModelDev/GeoModel

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mentioned in commit cc0fb0e1

merged