historywindow moved to mainwindow. Started to get rid of Q3PtrList finally
     1.1 Binary file icons/cursor.xcf has changed
     2.1 Binary file icons/cursorcopy.png has changed
     3.1 Binary file icons/cursorxlink.png has changed
     4.1 Binary file icons/history.png has changed
     5.1 Binary file icons/modecolor.png has changed