Calculate the width of an A0 column
column_width(number = 3, margin = 20, edge = 10)The desired number of columns with equal width.
the horizontal distance between columns in mm.
the width of the whitespace edge around the poster in mm.
Other utils: 
add_author(),
add_report_numbers(),
check_dependencies(),
column_start(),
cover_info(),
create_report(),
dyn_table(),
references(),
render_natbib(),
validate_doi()