Redesign register record structure
pigjar-34 Import & Export - import register (duplicates not handled)
Redesign register record structure - account_transaction add and delete functions added
Redesign register record structure - advance_pig_date refactored
Redesign register record structure - sundry minor items
Redesign register record structure - clean baseline
Redesign register record structure - permstor and test_permstor refactored
Redesign register record structure - change_cleared_status 1
Redesign register record structure - ynab_register except split and transfer corner case.
Redesign register record structure - ynab_register completed
Redesign register record structure - ynab_register completed
Merge pull request #53 from trin5tensa/pigjar-34

YNAB Register import completed. 
YNAB Budget import not implemented. The quality of information is poor and the amount is small. Extensive reediting would be required and at least equal to entering the data by hand.
Export has been deferred to a later enhancement.