Fix bug in OutputCheck program that calls driver. If OutputCheck is

installed by pip then when we run the test suite the installed version
gets used rather than the git repo version because the system import
is attempted and only if that failed would we look in the git repo
for the OuputCheck package.

Now we do it the other way round so if OutputCheck if being run from
the Git repository we use that in preference to a system installed
version.

bin/OutputCheck

@@ -1,14 +1,13 @@
 #!/usr/bin/env python
 import sys
 import os
-try:
-    import OutputCheck.Driver
-except ImportError:
-    # Try to see if we are being run from inside git repo
-    root = os.path.dirname( os.path.dirname( os.path.abspath(__file__) ))
-    if os.path.exists( os.path.join(root,'OutputCheck')):
-        sys.path.append(root)
-        import OutputCheck.Driver
+
+# Try to see if we are being run from inside git repo
+root = os.path.dirname( os.path.dirname( os.path.abspath(__file__) ))
+if os.path.exists( os.path.join(root,'OutputCheck')):
+    sys.path.insert(0, root)
+
+import OutputCheck.Driver
 
 if __name__ == '__main__':
     sys.exit(OutputCheck.Driver.main(sys.argv))