Launch of the United States Steam Gunboat Pinola.--This afternoon at 5 o'clock, Messrs. Abrahams & Ashcroft, from their ship-yard, eastern end of Thames street, propose to launch the United States gunboat Pinola, one of those authorized to be, built by the last Congress.--The Pinola is 158 feet in, length between stern posts, has 28 feet beam and 12 feet depth of...