Create, test, and update RL8 installation script

This needs to be done as support for #2 (closed).

Issue updated to include open items from #25 (closed), which is being closed out.

This ticket should have new items added to the checklist, discussed in comments, and checked off in the checklist when they're done.

Some things to be done:

• Update code for SL7/RL8 changes
• Move available files from local filesystems to dqsegdb-tools (rather than using files in /backup/segdb/ and other locations)
  • This has been largely done, but there are still some assorted files to be transferred
  • This is partially addressed here
• Move available files from local filesystems to dqsegdb-private (rather than using files in /backup/segdb/ and other locations)
  • This has been partially done, but there are still some assorted files to be transferred
  • This is partially addressed here
• Remove code related to user ldbd after the transition to user segdb is done (or at least far enough along that the code is no longer needed)
• Modify crontab backup system to use user segdb's home dir, then pull the latest one from there (esp. in run_block_8)