#3 PreparedStatement support and parameters

[Marc Prud'hommeaux]

It would be nice to be able to prepare a statement, and then
execute it later with the bound parameters. Something like:

sqlline> !prepare SELECT * FROM FOO WHERE ID=?
prepared statement: 1
sqlline> !stmnt 1 (int)10
1 row selected...
sqlline> !stmnt 1 (int)11
0 rows selected...