Updated changelog & TODO list

TODO.md

@@ -26,7 +26,6 @@
   - add more levels, in separate files, distributed with the installers
   - add info that reading grand staff from musicxml created out of Nootka is not supported
   - certificates would have some additional data about melodies
-  - exam summary - give more valuable info, display it nicely
   - charts - show preview of entire melody, chart tip is not suitable for it
   - migrate on preferred 48000 sample rate (ogg files and audio methods). DO NOT forget to resize output samples length
 

changes

 1.7.4 git
      - 'Got It!' texts about important Nootka features
+     - improved exam summary
      - handle notes beaming of each piano staves separately
      - plenty of tiny user interface improvements and fixes
     BUG FIXES