[lmi] MDI child frame and wxEVT_MENU_HIGHLIGHT

[Greg Chicares]

https://github.com/vadz/lmi/pull/8/commits/60ddc3976b8b0c1a3a966e032d10e144d46c9ebb
| Remove the attempts to use MDI parent status bar for menu help display.
|
| This code actually had no effect because the MDI child frame never received
| wxEVT_MENU_HIGHLIGHT anyhow and the help was (correctly) displayed in the
| parent frame status bar just because this is where all the events went.

Just to be sure, let me ask whether you carefully read lines 29-58 here:
  
http://svn.savannah.nongnu.org/viewvc/lmi/trunk/docmdichildframe_ex.hpp?annotate=6443&root=lmi
I'm quite sure that this code did have an effect eleven years ago when it was
written, and that comment block explains why. If you're saying that was never
true even in 2005, then I'd be surprised.