Warn on windows sqlite3 into(*, csv) and not on :memory:
Memory check should come first to avoid spurious warning on windows
Correct imports
chunk compute by uses split
Merge pull request #706 from mrocklin/chunk-split

chunk compute by uses split
Merge pull request #705 from cpcloud/sqlite-into-csv-fix

Warn on windows sqlite3 into(*, csv) and not on :memory: