[1.7.x] Fixed #23998 -- Added datetime.time support to migrations questioner.

Backport of 54085b0f9ba7d9f705f9b9c90d3433b0ef6aa042 from master
[1.7.x] Corrected scoping of savepoint example

Backport of 27f68f8659a648cc9ed3e71f690959ed8a130c5a from master
[1.7.x] Fixed #23959 -- Clarified when checks automatically run.

Backport of cf2390be164bcb3c5670f73b0a7062d6141f8664 from master
[1.7.x] Fixed #23525 -- Fixed admindocs crash on apps installed as eggs.

Thanks welbornprod for report and initial patch.

Backport of 01ab84c61330ffa5ac87c637249611c5e5343e57 from master