Disable installing PYO and PYC. Fix install paths.

Installing PYO and PYC does not work so disable this. Move the
Python check to the top level and have a single place.

Fix the install paths a revert the 'from . import' changes. This
is resolved by installing into the correct paths.

rtemstoolkit/execute.py

@@ -41,8 +41,8 @@ import subprocess
 import threading
 import time
 
-from . import error
-from . import log
+import error
+import log
 
 # Trace exceptions
 trace_threads = False