Feature request: #1476 Favourite tables select box.

Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>

Changes in "create_tables.sql".

Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>

Minor fix in structure.lib.php.

Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>

Ripped Trailing White spaces.

Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>

Removed irrelevant comments from "FavouriteTable.class.php".

Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>