conclusions: refactor manual assessments tooltip functions.
template: fix manual overall assessment section for habitatsummary.
summary: change nature_choices to match table column requirements.
mixins: fix get_regions for habitat.
template: merge auto/grided_maps.html for species and habitat.
template: add missing css class in manual assessments section.
Update README
habitatprogress: include dataset_id in join condition.
conclusions: fix decision validation.
progress: make "overall assessment" the default choice
docs: Add sphinx skeleton
summary: fix obscure chrome bug
merged from master