Cleanup, syntax errors always improved.

* Always output the best syntax error format, and do away with compatible
  syntax errors. Instead make the comparison restricted to the message
  of error only.

* This reduces tedious code and tried to mimic the various Python versions
  errors for no good reasons.

nuitka/SourceCodeReferences.py

@@ -28,7 +28,7 @@ from nuitka.utils.InstanceCounters import counted_del, counted_init
 class SourceCodeReference(object):
     # TODO: Measure the access speed impact of slots. The memory savings is
     # not worth it (only a few percent).
-    __slots__ = ["filename", "line", "future_spec", "internal"]
+    __slots__ = ["filename", "line", "column", "future_spec", "internal"]
 
     @classmethod
     def fromFilenameAndLine(cls, filename, line, future_spec):
@@ -44,8 +44,9 @@ class SourceCodeReference(object):
 
     @counted_init
     def __init__(self):
-        self.line = None
         self.filename = None
+        self.line = None
+        self.column = None
         self.future_spec = None
         self.internal = False
 
@@ -111,9 +112,22 @@ class SourceCodeReference(object):
         else:
             return self
 
+    def atColumnNumber(self, column):
+        assert type(column) is int, column
+
+        if self.column != column:
+            result = self._clone(self.line)
+            result.column = column
+            return result
+        else:
+            return self
+
     def getLineNumber(self):
         return self.line
 
+    def getColumnNumber(self):
+        return self.column
+
     def getFilename(self):
         return self.filename