supplementary details for transaction

[Uepsilon]

• changes line parsing. neccessary for transactions as they can have newlines within their details field
• includes initial amount details
• includes charges

related to #18

[bumi]

do you have a link to the spec of those /OCMT parts?

[Uepsilon]

we've implemented it according to https://www.kontopruef.de/mt940s.shtml