Genie:  Pass node& to reg filehandle constructors
Genie:  Elide RegularFileHandle
Genie:  Axe obsolete RegularFileHandle
Merge branch 'axe-RegularFileHandle'
Pedestal:  Axe superfluous seize_ptr()

This might have been useful with shared_ptr, but not with intrusive_ptr.
vfs:  Fix dir_contents leak in dir_contents_box