Resolve "MX sample viewer feedback"

Closes #269 (closed), #268 (closed)

• order is changed back to reverse-chronological
• New block 'Best collection for this sample' appears as a child of the sample if
  • 1. more than one collection for this sample and
  • 2. a best collection has been found.
  • This block will promote the best autoproc and dozor for this collection (+phasing to be added later on)