Add option to change checksum method in KOSync to be Binary or Filename based (#7840)
Add option to change checksum method in KOSync to be Binary or Filename based (#7840)

closes #7836
NiLuJe/koreader,Frenzie/koreader,koreader/koreader,koreader/koreader,poire-z/koreader,poire-z/koreader,NiLuJe/koreader,Frenzie/koreader