reformat [test_]concatenate to match rest of package, simplify code with itertools.chain.from_iterable
remove filename parameter support from csv2tsv and tsv2csv
setup.py
tox.ini
PEP8 clean up
PEP8 extract_map + fix code duplication - was reported by pep8 as long lines
some doc content
split tool (still need some work)
@in_temp_dir: restore current directory before tempdir is removed
split - usable as script