datafile no longer 1.8 compatible with r13734

[David Hampton]

On Thu, 2006-04-06 at 22:59 +0200, Christian Stimming wrote:
> The latest 1.9.x releases *used* to write a data file that could still be read 
> by 1.8.12. That was a very convenient way to get used to the new version but 
> all the while keep the 1.8.12 version around and working. My data file in 
> question is quite simple -- no business features, no stocks, but nevertheless 
> 2-3 different currencies and extensive HBCI features.
> 
> However, with one of the "commodity namespace" related changes in the last 
> days, this is now no longer the case. When reading the file as written by 
> r13734 in 1.8.12, gnucash barfs with the error message below, and contrary to 
> beforehand gnucash-1.8.12 will not open any data. (gnucash shows an empty 
> account hierarchy.)

This was my change to allow users to indicate that stock quotes should
be retrieved for specified currencies.   I can change the code to write
out complete information on the currency, but I will have to go build a
1.8 tree to test against.

David