optimize query data for student hint history
Merge branch 'master' of https://github.com/yoavfreund/Webwork_AdaptiveHints
Merge branch 'master' of github.com:yoavfreund/Webwork_AdaptiveHints into filter_func
commit more files

commit more files for the change of querying data of student hint
history
Merge branch 'master' of github.com:yoavfreund/Webwork_AdaptiveHints into filter_func

Conflicts:
	src/adaptive-hint-servers/rest_server/rest_server.py
Remove debug=True
Allow collapsing filter function and grouping sections on problem part page.