* illegal report
1, add illegal report at shared file page
2, list all illegal reports at admin page
* add ENABLE_SHARE_LINK_REPORT_ILLEGAL setting
* UserRateThrottle -> AnonRateThrottle
* use to_python_boolean
* frontend by React
* remove illegal report dialog in shared dir view
* add migrations dir
* add illegal_reports migrations
* rename illegal to abuse in api
* rename illegal to abuse in test
* rename illegal to abuse in share file view
* rename illegal to abuse in react
* rename illegal to abuse in Backbone
* add enableShareLinkReportAbuse in templates
* add ReportAbuse
* update ReportAbuse
* update ReportAbuse urls
* update ReportAbuse api-js
* sysadmin_react_app.html
* sysadmin.py
* fix
* fix
* fix
* can not abuse own file
* Contact Information is required.
* fix review
* remove repo icon
