* [refactor] user permissions

* [fix] tests

* [ux] user-permissions

* [minor] cleanup system settings

* [minor] end progress

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement

* python 3 compatible raise statement