Find the correct boost lib for the python version used.
Merge branch 'master' of https://github.com/est77/appleseed
added max ray intensity test suite.
watchfolder.py 1.10: clean up the provided (or determined) user name to ensure it will not cause problems as part of a filename.
all Python scripts now look for the tools in the same directory as the scripts themselves, if no tool path is specified.
watchfolder.py 1.12: more robust handling of appleseed.cli version query errors.
in the microfacet BRDF, renamed the "Distribution Function Parameter" input to "Glossiness", and added a "Glossiness Multiplier" input.
code tweak.
improved exception handling.
in those shaders, all AOVs must be set to black.
tweaked comments.
watchfolder.py 1.13: clean up the user name *before* opening the log file whose name depends on that user name.
Merge upstream.