Grainfather App default measurement conversion and display#245

It would be very helpfull if you added in the user profile an option to display recipes in a user specified measurement units for example adding the following 4 options

1. default - show the recipe in the format of the auther
2. metric - show the recipe using metric measures
3. Imperal - show the recipe using imperal measures
4. both - show the recipe with both imperal and metric conversions for all ingredents.

It would be nice if metric is truely metric, through and through. Now e.g. the PPG is not metric.