Add Tools/scripts/patchcheck.py. Invoked from `make check`, the script does

some verification:

- Runs reindent.py on all .py files.
- Checks if any changes in Doc exist.
- Whether Misc/ACKS was changed.
- Whether Misc/NEWS was changed.

The hope is that ``make check`` can become a command anybody can run to get
reminders about what all the requisite steps needed to create a proper
patch/checkin.

Tools/scripts/reindent.py

@@ -130,9 +130,11 @@ def check(file):
             f.close()
             if verbose:
                 print "wrote new", file
+        return True
     else:
         if verbose:
             print "unchanged."
+        return False
 
 def _rstrip(line, JUNK='\n \t'):
     """Return line stripped of trailing spaces, tabs, newlines.