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/git.py

@@ -31,11 +31,11 @@
 
 import os
 
-from . import error
-from . import execute
-from . import log
-from . import options
-from . import path
+import error
+import execute
+import log
+import options
+import path
 
 class repo:
     """An object to manage a git repo."""