[NTG-context] Architectural paper sizes

Hello, I made definitions for the architectural paper sizes, usually known as ArchA, ArchB, etc. I don't know if you want to add them to base/page-lay.mkiv. % Architectural sizes \definepapersize [ArchA] [\c!width=9in, \c!height=12in] % 3:4 \definepapersize [ArchB] [\c!width=12in,\c!height=18in] % 2:3 \definepapersize [ArchC] [\c!width=18in,\c!height=24in] % 3:4 \definepapersize [ArchD] [\c!width=24in,\c!height=36in] % 2:3 \definepapersize [ArchE] [\c!width=36in,\c!height=48in] % 3:4 \definepapersize [ArchE1] [\c!width=30in,\c!height=42in] % 5:7 \definepapersize [ArchE2] [\c!width=26in,\c!height=38in] % 13:19 \definepapersize [ArchE3] [\c!width=27in,\c!height=39in] % 9:13 -- Kate