Add additional test dependencies

These are now noted in requirements.txt

Also make dependency on 7zip and ffmpeg explicit in README

Signed-off-by: Will Beason <willbeason@gmail.com>

test/Wikiq_Unit_Test.py

@@ -5,11 +5,14 @@ from shutil import copyfile
 import pandas as pd
 from pandas.testing import assert_frame_equal
 from io import StringIO
+import tracemalloc
+
+tracemalloc.start()
 
 # with / without pwr DONE
 # with / without url encode DONE
 # with / without collapse user DONE
-# with output to sdtout DONE
+# with output to stdout DONE
 # note that the persistence radius is 7 by default
 # reading various file formats including
 #        7z, gz, bz2, xml  DONE