FIX wrong access to debug configuration value.

Also adds the option to the config spec.

pubs/config/spec.py

@@ -22,6 +22,9 @@ open_cmd = string(default=None)
 # "kate --block"
 edit_cmd = string(default='')
 
+# If true debug mode is on which means exceptions are not catched and
+# the full python stack is printed.
+debug = boolean(default=False)
 
 [formating]
 

pubs/uis.py

@@ -62,7 +62,7 @@ class PrintUI(object):
                                                         errors='replace')
         self._stderr  = codecs.getwriter(self.encoding)(_get_raw_stderr(),
                                                         errors='replace')
-        self.debug = conf.get('debug', False)
+        self.debug = conf['main'].get('debug', False)
 
     def message(self, *messages, **kwargs):
         kwargs['file'] = self._stdout