Submodule fost-base aa54684..18d86a1:

> Added a new test macro `FSL_CHECK_ERROR`
> Accept both CR and CRLF line ending file sizes.
> Fix a problem where a temporary result was being returned.
> We can't make use of C++11 features in this part of the code base.
Set up the glossy ball surface settings to something sane.
Compensate for the light lost in other directions.
Increase the default image size so it's easier to see details.
These tests need to take into account preservation of energy on the matte surface.
Allow us to pass in the number of spheres to use on the command line.
Set consistent size and output file name.
Tweak reflectance level.