Start quote functional tests

I begin to implement the quote functional tests.  Until now I test
creating quotes, displaying the show view, and the list view.  I also
begin to implement testing the edit action but there are some errors in
the item management which must be fixed first.

I fix a bug that the JavaScript invoicing-items.js file does not respect
the currency symbol defined in the <html> tag.  Then I fix some bugs
which occurred when testing quotes.