#94 0.2.0 Supplier select: show ext id

[wignoxqs]

On selecting the supplier, show the external id i.e. somewhere in mouseover (it is only to see in "edit" supplier now).
Why: To compare the selected supplier with the external supplier-data-source: is the selected supplier who we think it is, i.e. common names, check data of external system with data printed on the invoice in front of you.
Mouseover above supplier description would do - or fixed field in front of or at end of this text field.