Install for centos 8

[Rob-McKay]

Added install instructions for installation onto a clean Centos 8 install.

This also includes a small change to get the bootstrap script to work if a new enough version of the Intel TBB library is not present. (The installed version is not new enough by default under Centos 8)

[arthaud]

Hi @Rob-McKay, thanks for the contribution.

Could you please fill the Contributor License Agreements and send it to [email protected]?

[Rob-McKay]

Hi @Rob-McKay, thanks for the contribution.

Could you please fill the Contributor License Agreements and send it to [email protected]?

I've emailed the form as requested.

[ivanperez-keera]

@Rob-McKay Following up on this. AFAICT, Centos 8 was discontinued. Is this PR something that still makes sense to merge (e.g., if adapted for a successor) or would it be best to close for now?

[ivanperez-keera]

Pinging @Rob-McKay . If we get no response, I believe we should close it for the reasons stated here.

[Rob-McKay]

I would prefer that it was merged to aid others with using other OS's.