Remove redundant syntax elements in library code.
changing add.sql for SQLite3.
removing del.sql.

Just do "rm test.db".
Eta reduce.
modifying example scripts for SQLite3.
Fewer import lines.
Drop deprecated driver interfaces.
Ignoring import/export shortcut hint.
Drop deprecated definitions.
Drop needless definition.
Remove unused pragma.
Using record pattern.
SQLite3 example scripts.