introduce custom Manager to reduce child classes in Sample.objects queries
return sub-class instances in Sample Admin
customize general Sample Table with filters and sub-class content display
fix template mixup between DNA and superclass Sample; color-code sample.Status
color-code component status
make status color-coding more consistent
modify app_index to also show recent actions at this level
Reworked landing page (index and app_index.html)
clean up
fine-tune landing page
cosmetics
include images in landing page
cosmetics
location readonly view with rack table
Rack readonly view and better truncate template filter.
container readonly view with refined sample table; improvements to rack view
cosmetics
revert accidental deletion