fix issue where json would be printed to stdout even though outF is another file

While we are at it, removed unnecessary global declarations and add what I presume were missing return statements

Since I am unsure how to properly test these things I submit it for review.

common/python/nomadcore/simple_parser.py

@@ -936,9 +936,7 @@ class SimpleParser(object):
         self.skipped = 0
         self.superContext = superContext
         self.annotateFile = None
-        global highlightmode
         self.matchHighlighter = MatchHighlighter(highlightmode)
-        global annotate
         if annotate:
             annofilename=fIn.fIn.name + ".annotate"
             logger.info("writing annotated input to " + annofilename)
@@ -960,9 +958,9 @@ class SimpleParser(object):
             for s,gIndex in reversed(list(cNow.sections.items())):
                 self.backend.closeSection(s, gIndex)
             cNow.startEnd = ParsingContext.End
-            True
+            return True
         else:
-            False
+            return False
 
     def contextPop(self):
         cNow = self.context.pop()
@@ -1184,7 +1182,7 @@ def mainFunction(mainFileDescription,
     # Initialize the backend where the final results are printed after they are
     # possibly filtered by the caching ActiveBackend.
     if superBackend is None:
-        jsonBackend = JsonParseEventsWriterBackend(metaInfoEnv, sys.stdout)
+        jsonBackend = JsonParseEventsWriterBackend(metaInfoEnv, outF)
     else:
         jsonBackend = superBackend