Add some debug to cave parser as it's easy to make it fail

e.g. by referring to slugs that don't exist.

parsers/caves.py

@@ -74,6 +74,7 @@ def readentrance(filename):
                          cached_primary_slug = slugs[0])
             e.save()
             primary = True
+            print "list of <Slug> <Filename>"
             for slug in slugs:
                 print slug, filename
                 cs = models.EntranceSlug(entrance = e,
@@ -86,6 +87,7 @@ def readcave(filename):
     with open(os.path.join(settings.CAVEDESCRIPTIONS, filename)) as f:
         contents = f.read()
     context = " in file %s" % filename
+    print "Reading file %s" % filename
     cavecontentslist = getXML(contents, "cave", maxItems = 1, context = context)
     #print cavecontentslist
     if len(cavecontentslist) == 1: