Removes obsolete technical details placeholder block
Add 'X' back into databases prefix option (since xSearch is now cataloged as a db).
Merge pull request #945 from sul-dlss/remove-placeholder-block

Removes obsolete technical details placeholder block
Merge pull request #947 from sul-dlss/db-x

Add 'X' back into databases prefix option...
Adds text and other improvements to record view side bar