Transform header complete (in theory...).
Progress on transforming entries, but not done.
Should add some tests for the transforms functions too?
Added transform-account
Completed transform-amount, transform-entry, and transform-entries.
Moved optional "-" to within the regex when parsing quantity.
Basic / optimistic parsing done.
Cleaned up some of the parsing code (convert map to record easier).
Fixed parsing of transactions with tab/space on separating line.