PHLEGM v7 data-driven root checkpoint

<$project> = PHLEGM
<$version> = 7
<$proper> = Phlegmulator
<$credits> = Design: Tim Keal, Code: Ariel

Derived directory template: <$project> v<$version>
Developer working directory: PHLEGM v7/
End-User archive root: PHLEGM v7/
Final non-destructive install directory: PHLEGM v7/
upstreamInstallRelative template: ../../<$project> v<$version>

Unknown-duration compiler progress remains the known-good two-step mapping: source 0-97% => visible 0-30%; source 97-100% => visible 30-100%.
