[bug-gtypist] Backspace 0407 interferes with 'c with acute' U+0107

[Kalthor]

  Hello,

I noticed that it is not possible to input one of the Polish diacritic letters 
'c with acute' (unicode 0x107 = 263) because it interferes with KEY_BACKSPACE 
defined in ncurses.h (0407 = 263)

I removed rc == KEY_BACKSPACE from the condition in lines 700 and 991 which 
seems to help on my platform: 
ubuntu 12.04,
gtypist 2.9.1

Can't say if this is portable.

  Cheers,
  K.