Merge pull request #220 from Jrendl/improve-source-info-mk

Improve Performance of source_info.mk()

src/vsc/model/source_info.py

@@ -25,7 +25,7 @@ def mk(cls, levels=1):
         if len(stack) <= (levels+1):
             raise Exception("requested stack frame %d out-of-bounds (%d)" % (
                 levels, len(stack)))
-        frame = inspect.stack()[levels+1]
+        frame = stack[levels+1]
 
         return cls(frame.filename, frame.lineno)