- provide a chroot_user definition during prop finalize
- let shellclass be depend on the object built
- have all shells store prop and have access to it
- move the chrooted code into default core shell
- tweak running so that quoting/building commands happen everywhere
- change Config to recognize -B as a chroot override.
Tested thru distant chroot, local and distant !chroot
local chroot still not working, probably missing something stupid
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