Fix several issues in the gstreamer removal PR

Patch by JoeLametta

morituri/common/checksum.py

@@ -20,14 +20,10 @@
 # You should have received a copy of the GNU General Public License
 # along with morituri.  If not, see <http://www.gnu.org/licenses/>.
 
-import os
-import struct
-import zlib
 import binascii
 import wave
 
 
-from morituri.common import common, task
 from morituri.extern.task import task as etask
 
 from morituri.program.arc import accuraterip_checksum

morituri/common/encode.py

@@ -20,15 +20,9 @@
 # You should have received a copy of the GNU General Public License
 # along with morituri.  If not, see <http://www.gnu.org/licenses/>.
 
-import math
-import os
-import shutil
-import tempfile
 
 from mutagen.flac import FLAC
 
-from morituri.common import common
-from morituri.common import task as ctask
 from morituri.extern.task import task
 
 from morituri.program import sox

morituri/common/program.py

@@ -515,8 +515,6 @@ class Program:
 
         @param trackResult: the object to store information in.
         @type  trackResult: L{result.TrackResult}
-        @param number:      track number (1-based)
-        @type  number:      int
         """
         if trackResult.number == 0:
             start, stop = self.getHTOA()