Can't profile inner functions

``` python

def foo():
@line_profile
def foo_inner():
pass
```

This won't work because the reference to foo changes (local variable I believe)

Reproduce the nested-function example from the issue and inspect how the line profiler panel resolves the decorated inner function. The work is done when an inner function defined inside another function can be profiled successfully; the payload does not name a source file or test to start from.

Written by the indexing model from the issue text.