Generate a recent-years.journal on each level similar

[apauley]

In #5 we created an all-years.journal for each owner, bank and account.

Pointing your LEDGER_FILE to this all-years.journal may become slow for people with many years of input data.

Write a recent-years.journal next to each all-years.journal which contains only the 3 most recent years, where "3" should probably be a command-line option with a sensible default if not specified