scripts: Disabled local import hack on import

Moved local import hack behind if __name__ == "__main__"

These scripts aren't really intended to be used as python libraries.
Still, it's useful to import them for debugging and to get access to
their juicy internals.

scripts/plot.py

@@ -10,7 +10,8 @@
 #
 
 # prevent local imports
-__import__('sys').path.pop(0)
+if __name__ == "__main__":
+    __import__('sys').path.pop(0)
 
 import bisect
 import codecs