* Fixed #206 implement user login and authorization using blueprint user and flask-login

* Fixed #206 implement user login and authorization using blueprint user and flask-login

* Fixed #201 UML: blueprint user
* Fixed #205 navbar is broken
* Fixed #202 add blueprint user
* Fixed #203 find python module for blueprint user
* Fixed #204 add python module for blueprint user

* Fixed #205 navbar is broken
* Fixed #202 add blueprint user

* Fixed #199 Database export without gzip
* Fixed #200 Database import without gzip

* Fixed #60 frontend: better design for tables
* Fixed #62 frontend: better design for pages
* Fixed #197 UML use cases for OWID reports and Visaul Data

* Fixed #194 dependency is unsecure

* Fixed #194 dependency is unsecure

* Fixed #194 dependency is unsecure

* Fixed #194 dependency is unsecure

* Fixed #194 dependency is unsecure

* Issue #194 dependency is unsecure

* Fixed #28 /admin/database/import
* Fixed #66 frontend: migrate to Bootstrap Theme sb-admin-angular
* Fixed #158 load Bootstrap-Template sb-admin-angular into static
* Fixed #191 setup plantuml for engineering and docs
* Fixed #156 run_web.sh
* Fixed #157 run_worker.sh
* Fixed #62 frontend: better design for pages
* Fixed #60 frontend: better design for tables