Add ToDataTable, support CSV without headers, tests
Update README.md
Renaming series, preserve unordered flag on indices
Ultimate rename action
Merge remote-tracking branch 'upstream/master'
Update version, finish rename
Fix #47 - improve error messages
Join frame and series, more tests, better error messages (fix #48 and #45)
Document some frame operations (fix #46)
Merge remote-tracking branch 'upstream/master'