Moving rows in OO.o Calc (OpenOffice.org Spreadsheet)
It turns out that neither Calc nor Gnumeric has an option to move (or swap) rows (or regions) up and down (while MS Excel does). (Someone asked about moving rows in Calc on their mailing list.)
Bugs have been filed (at least) at
Rather perversely, the documentation on how to install this library (and others) is in another library entirely, which can be got from their site.
Update: See the comments; it appears to have been fixed now.