NCursesWindow::err_handler() non-virtualness

[stephan beal]

Hi, ncurses developers!

Two weeks ago i started working with nc++'s code. Unfortunately, the 
levels of changes i need to make aren't in line with historical nc++ 
classes, so i've forked in copies for hacking in my tree. A couple 
changes could definately improve the core tree, however, and would be 
backwards compatible (API, anyway, not binary). The most glaring one 
which comes to mind is the non-virtualness of 
NCursesWindow::err_handler(). This makes it pretty useless for people 
not willing to edit their local copies of nc++ (which is most people, i 
imagine). Making it virtual would be a big help :).

Take care,

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