[GNC] Finance::Quote Default Currency Module

[Bruce Schuck]

Hello all,

I'm getting ready to release Finance::Quote v1.60 to CPAN. It appears 
that AlphaVantage has again changed how they deal with throttling for 
requests using the free API keys/tokens. This has affected some users 
that may have data that requires doing more than a handful of currency 
exchange calculations.

While the currency module used can be changed using the FQ_CURRENCY 
environment variable, I have been asked to change the default to 
YahooJSON instead of AlphaVantage.

Before I make such a change I wanted to get a general consensus from the 
GnuCash users.

Thank you.

Bruce S.