unifying benchmark settings
minor
Change benchmark parameter average_nozero_symbols to density
updated the NEWS file
Merge pull request #45 from steinwurf/change-benchmark-parameters

Change benchmark parameters
Fix support in Reed-Solomon for fifi::binary16

The systematic_vandermonde_matrix_base.hpp invoked the incorrect
functions on the matrix.
Updating the NEWS.rst file
merge with master
Merge branch 'master' into change-benchmark-plotting-scripts