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 link to instance settings
add subheadings in process settings
mv use_norms from general to process settings
fix allow_index (no ui)
fix test case test_to_dict in test_instances
restore votedetail_badges to instance settings
Merge pull request #666 from xi/feature-665-restructure-instance-settings

restructure instance settings