add setter methods for annotator field widths

With this, a parser can override the default field widths via
superContext.startedParsing:

def startedParsing(self, path, parser):
    # reconfigure width of SimpleMatcher name
    parser.annotator.set_formatNameWidth(42)
    # reconfigure width of source file where SimpleMatcher was defined
    parser.annotator.set_formatSourceWidth(10)

common/python/nomadcore/annotator.py

@@ -25,6 +25,14 @@ class Annotator(object):
         self._annotate_format = '%%%ds:%%04d %%%ds %%7s|%%s' % (
             self._formatSourceWidth, self._formatNameWidth)
 
+    def set_formatSourceWidth(self, formatSourceWidth):
+        self._formatSourceWidth = formatSourceWidth
+        self._update_annotate_format()
+
+    def set_formatNameWidth(self, formatNameWidth):
+        self._formatNameWidth = formatNameWidth
+        self._update_annotate_format()
+
     def annotate(self,match,line,matcher,targetStartEnd):
         if not self.annotateFile:
             return 1