lib/sqlite3: no need for a directory anymore

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sqlite3: implement column_blob

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sqlite3: add some doc

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sqlite3: implement Statement::reset & finalize

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sqlite3: implement Sqlite3::is_valid

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
sqlite3: use sqlite3_close_v2

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
Merge: Some minor improvements to Sqlite3

Will be used to implement #559 under Linux.

Pull-Request: #569
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>