deprecate instance.allow_thumbnailbadges
restructure instance settings templates
rename some settings
rename routes and controller functions
update settings validators
update settings forms
update settings defaults
update settings updates
Fix typos (s/updated_attributes/update_attributes)
Fix link to instance settings
pep8
Remove redefinition of InstanceMembersEditForm
add subheadings in process settings
mv use_norms from general to process settings