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During BootRun, see if !Scrap is in the root of the boot drive.
During SetChoices, see if !Choices is in the root of the boot drive.

Version 1.31. Tagged as 'DesktopBoot-1_31'

After setting BootResources$Things, Choices$Things, Boot$Things a new service call is sent to allow, for example, ROM based modules to react to any implications of that change.
R0 is defined as flags, currently all 0, might be useful one day.
Tested briefly.

Version 1.19. Tagged as 'Boot-1_19'

Clarify comment in 350 patches
Fix bug in SetChoices where it tried to create 2 levels of directory in one operation, leading to choices not getting copied over correctly

Version 1.12. Tagged as 'Boot-1_12'

Manually tagged as Boot-0_91.