Export using SQL insert

Would be great to be able to export a table using SQL inserts. Right now only CSV seems to be available. Copy Special is great, but works only for the selected rows, not for whole tables.

Or if SQL inserts are hard to implement, perhaps just importing CSV would be nice.
How I do it now: `COPY table FROM 'xxxx.csv' DELIMITER ',' CSV;`

No files or tests are named. Start by locating the existing CSV export and Copy Special entry points, then clarify whether whole-table SQL INSERT export or CSV import is the intended scope. Done means the selected operation works for an entire table, not only selected rows, with behavior covered by an appropriate test or manual check.

Written by the indexing model from the issue text.