Make bank creation available in dropdown lists

[Yann-BUTSCHER-EIRL]

Context

When someone pay by check we need to identify the check's bank. There is an issue (#215) for that but, we also need to be able to add a new bank "on the go".

To be able to do that, we should make the bank dropdown writeable and, when a new written in the dropdown, save it.

When saving the bank name we need to sanitize the user input to prevent double entries.

Todo

• Make bank creation available in dropdown lists
  • donation creation form
  • donation edition form
  • membership creation form
  • membership edition form
• On bank creation, sanitize user input (in this order)
  • Trim all fore and end spaces
  • To lower case
  • No more that one following space (remove double, triple space)
  • Uppercase the first letter for each sub-string separated by one space