TrsrDB:
fixed Id -> credId
autobalance -> make_transfers
TrsrDB::Account:
added history accessor
TrsrDB::Balance:
added fieds earned spent and even_until, renamed credit to available
TrsrDB::CurrentArrears:
fixed account -> debtor in relation declaration
schema.sql:
fixed triggers
deactivated trigger enforceFixedCredit
extended Balance with some more fields
t/schema.{sql,out}
trivial fixes
t/schema.t added tests:
Get balances after transfers
partial use of credit,
indirect transfers
Renamed "debts" to "arrears", because of psychologically slightly more positive
connotations. Renamed field "Id" of table Credit to "credId" in analogy to
field "billId" of table Debit.
