[Bldg-sim] Radiance Official 4.2 Release

[Guglielmetti, Robert]

Following a long alpha/beta period, Radiance 4.2 is official. NREL has created a release tag and binary packages on our git mirror of the Radiance source repository. Some noteworthy items:
* This is the second NREL release based on core RT code revision 4.2.b, and includes new Hessian-based error control in ambient cache.
* gendaymtx has changed to include a header on output, which causes an incompatibility with OpenStudio's Radiance-based daylighting routines. A fix will be included in the next iteration release of OpenStudio.
* This version includes the new rfluxmtx utility,  which should ease the pain of using rcontrib for 3- and 5-phase calculations, as well as a host of other novel applications.

Linkage:

Main Radiance source repository (cvs), hosted at LBL:
http://radiance-online.org/cgi-bin/viewcvs.cgi/ray/?pathrev=MAIN

NREL's git mirror of the cvs:
https://github.com/NREL/Radiance/tree/combined

Source code snapshot for official Radiance release 4.2:
https://github.com/NREL/Radiance/tree/4.2

Current Radiance Release (4.2):
https://github.com/NREL/Radiance/releases/tag/4.2

Windows installer:
https://github.com/NREL/Radiance/releases/download/4.2/radiance-4.2-win32.exe

Mac installer (Universal, 10.8 or greater)
https://github.com/NREL/Radiance/releases/download/4.2/radiance-4.2-Darwin.dmg

Linux binary archives (32/64bit, include library files):
https://github.com/NREL/Radiance/releases/download/4.2/radiance-4.2-Linux32.tar.gz
https://github.com/NREL/Radiance/releases/download/4.2/radiance-4.2-Linux64.tar.gz

As ever, a tremendous debt of gratitude is owed to Greg Ward, LBL, and DOE for the continued work on and funding for Radiance. So, thanks.

- Rob G. / NREL

P.S. True to form, Greg is already hard at work on the next version. Look for Radiance v4.3a on the NREL git mirror soon…