[Feature Request] Export DataFrame/Series
Often when having difficulty solving a bug users resort to posting a question on a site such as stack overflow. Part of the question is inevitabley giving some background on their data. However in order to fix the issue other users occasionally have to try and recreate their dataset, this may be done incorrectly (misunderstanding column names or datatypes etc). As such it would be useful if users could run `df.export_text()` which would produce an ascii table that is both human readable and could be imported with `df.import_text(df.export_text())`. 