Added county to School and migration for it.

Also updated gather_siteinfo to provide correct parameters when
creating a new School.

refs #15957
Updated School.serialize() to include 'county'.

refs #15957
Merge branch 'enhancement/15957' into develop
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

refs #16029
pep8: Site

refs #16029
pep8: SiteDetail

refs #16029
pep8: Course

refs #16029
pep8: CourseDetail

refs #16029
pep8: sites_courses

refs #16029
Merge branch 'bug/16029' into develop
Renamed objects to districts.

More clear than before.

refs #14745

Conflicts:

	orvsd_central/views.py