Add property:Currency to Account
Add property:Currency to DoubleEntryDetail
Rename stampedAmount to amount
Re-model DoubleEntryDetail
DoubleEntryDetail is a positionable
Cleanup, with __clone defined and unused DoubleEntry accessor removed
No need for one-to-one with DoubleEntry, financeDocument can directly implement what DoubleEntry does.
Missing use statement
Add property:Currency to Account
Fix Account __toString()
Implement Basic DoubleEntry (Without Currency conversion support)