Add hover-over functionality for Sprint 5 dashboard

[glass-w]

Description

Supersedes #115 - merge with sprint-5 branch instead.

Todos

This PR adds hover-over "info" icons to columns in the Sprint dashboard using popovers.

• [x] Add hover-overs to "transformations" page
• [x] Add hover-overs to "summary" page
• [x] Add hover-overs to "compounds" page
• [x] Add hover-overs to "microstates" page

  Questions

• [x] Are the descriptions sensible?

Status

• [x] Ready to go

[glass-w]

Snapshot of how this looks on the dashboard:

[glass-w]

@jchodera Thanks, all changes have now been made. Ready to merge.