1. fix maximum y scale in time line chart.
2. in caoruse showing observation then checklist. showing title of
checklist instead of species name.
3. maintaining order of observation and checklist in prev next
4. supressing obs without media in pre next on default ordering
Merge branch 'biodiv_usergroups' of github.com:strandls/biodiv into biodiv_usergroups
on groups member page sort by activity showing wrong result fixed.