Updates the BulkInsertRecords method to optionally close the trans - shouldn't by default. Updates how permissions are handled in the new services and exposes another method, ensures it's all wrapped in trans and ensures that cache is cleared properly. Fixes: U4-4213 "Replace child node permissions" does not work if all permissions cleared
Merge remote-tracking branch 'origin/6.2.0' into 7.1.0

Conflicts:
	src/Umbraco.Core/Persistence/Repositories/ContentRepository.cs
	src/Umbraco.Core/Persistence/Repositories/Interfaces/IUserRepository.cs
	src/Umbraco.Core/Persistence/Repositories/PermissionRepository.cs
	src/Umbraco.Core/Services/UserService.cs
	src/Umbraco.Tests/Services/PerformanceTests.cs
	src/Umbraco.Web/Cache/CacheRefresherEventHandler.cs
Merge branch '7.1.0' of https://github.com/umbraco/Umbraco-CMS into 7.1.0
restores BuildBelle