Ignore vim *.swo files
Rename create_final_report()

New name better refects that it creates reports for all flows
Update comments
Make last_width in 'struct column_state' to size_t
Delete whitespace
Delete whitespaces in flowgrind.h
Cosmetic changes
Fix compiler warning
Merge pull request #191 from alexander-zimmermann/next

Nits & Complier warnings & whitespaces