Some elisp functions depend on a date-format supplied in ~/.ledgerrc. Change these by introducing a default ("%Y/%m/%d").
Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
One can forget to run ledger-schedule-upcoming for some time. Then there
is the risk that ledger-schedule-look-backward is too short. This will
open the possibility to use a different file, or to change the period
backward or forward for this kind of case.