Removed GNA, Opal and serrano elements from release per release plan

Merge Pull Request sstsimulator#1660 from mjleven/sst-elements/instal…

…l-thornhill-hdrs

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PR Title: hermes needs these headers to be installed
PR Author: mjleven

removing elements not to be released, and setting release number

Merge pull request sstsimulator#1557 from sstsimulator/devel

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Changes to update revision for SST-10

Merge pull request sstsimulator#1483 from sstsimulator/devel

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Tailor for new SST version

Standard tailoring for release

Merge pull request sstsimulator#1382 from sstsimulator/devel

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Post-branch tailoring

Adjust copyright dates

Merge pull request sstsimulator#1292 from sstsimulator/devel

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