models: cleaned up User

refs #16029
models: cleaned up District

refs #16029
models: cleaned up School

refs #16029
models: cleaned up Site

refs #16029
models: cleaned up SiteDetail

refs #16029
models: cleaned up Course

refs #16029
models: cleaned up CourseDetail

refs #16029
pep8: User

refs #16029
pep8: District

refs #16029
pep8: School

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pep8: Site

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pep8: SiteDetail

refs #16029
pep8: Course

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pep8: CourseDetail

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pep8: sites_courses

refs #16029
Merge branch 'bug/16029' into develop