sync per mods, version.h and dockerfile to 2.1.6

docker/Dockerfile

src/binary_c_version.h

src/perl/modules_targz/Binning-0.03.tar.gz

src/perl/modules_targz/Data-Serializer-RobJSON-0.05.tar.gz

src/perl/modules_targz/Hash-RobMerge-0.14.tar.gz

src/perl/modules_targz/Histogram-0.01.tar.gz

src/perl/modules_targz/IMF-0.05.tar.gz

src/perl/modules_targz/Maths_Double-0.01.tar.gz

src/perl/modules_targz/binary_grid-v2.1.5.tar.gz

src/perl/modules_targz/binary_grid-v2.1.6.tar.gz

src/perl/modules_targz/binary_stars-0.05.tar.gz

src/perl/modules_targz/cosmology-0.01.tar.gz

src/perl/modules_targz/distribution_functions-0.05.tar.gz

src/perl/modules_targz/rob_misc-0.16.tar.gz

src/perl/modules_targz/robqueue-0.05.tar.gz

src/perl/modules_targz/spacing_functions-0.02.tar.gz