Renamed ImageReading's is_corrected method to is_adjusted.
Refactored ApplicationView.show_accept_source_dialog to receive 
parameters explicitly instead of bundled in a tuple.
Added note1_default optional parameter to AcceptSourceDialog.
Note 1 is now set to the hand adjusted value by default in the accept 
source dialog if the current source location has been adjusted in the model.
Merge pull request #110 from drusk/note1_hand_adjusted

Implements point 4 of #101.