Now using historic data via free apikey from Alpha Vantage. 
         Basic data fetching and data display is working.
         The indicator API does return data for some markets like USA , UK
         but not yet for others like Germany , Hongkong etc.
         The plan is to add portfolio management and analysis.
         Basic charts can currently be displayed via gnuplot.

         Data drawn from the API still seems to have occasional holes 
         especially for non US market stocks or is not available all
         the time . Often two or more hits are needed for the API
         to return data . Sometimes the API returns error messages
         of being hit too fast , despite one hit per second being
         the advertised capability and sufficient time spacing on the
         client side.
         Indicator data returns json data fine , but currently only for certain US stocks. 
         Batch fetching of stock data only works for US market components and may return
         a default timestamp of 1969 during off trading hours.

        Data quality and speed has slightly improved , unfortunately the free apikey now has a
        standard call-frequency limit of 4-5 requests per minute , which is much too low
        for any reasonable work.
        Of course there is the premium option which allows more requests / minute. 
        Kitco metal prices are not effected by this call limit . 
        The library has been updated to work with nim 0.19.x 
        If sudden crashes occure see : cat /dev/shm/avdata.csv
        most likely reason is inserted nagging lines by the api to ask for registration
        and once registered ask to visit their premium site.

        Made the library compile with latest nim devel
        Call frequency limit stated above has unfortunately not improved so far.
        The current nagging line is:
           "Thank you for using Alpha Vantage! Our standard API call frequency is 5 
           calls per minute and 500 calls per day."
        
        Another option may be IEX https://iextrading.com/developer
        a very limited free plan appears to be available

        Library works with Nim 1.5.1

          Alpha Vantage Api support            
          
                     
          Dataframe for display and easy working with dataseries
          
          Multiple accounts and portfolios management
          
          Returns calculations and more
          
          Williams R% calculation
          
          Indicator displays
                  
          Kitco Metal Prices    
          
          US market spot prices
          
          Digital currencies 5 min intraday prices .               

  Planned to be in
  
  http://qqtop.github.io/nimFinLib.html

  # http://qqtop.github.io/libFinHk.html

  nimexrates  
  nfT53       
  nfT55  
  nfT60     
  nimmetal    

  nimcx         nimble install nimcx
  
  nimdataframe  nimble install https://github.com/qqtop/nimdataframe.git

  nimble install nimFinLib 
  
  Note : it is always a good idea to install the latest libraries

 Improvements may be made at any time.              
 Forking ,testing, suggestions ,ideas are welcome.
 This is development code , use at your own risk.
 
 
 
 Tested on openSuse TumbleWeed, Debian Testing