Multi-Currency Part 2 (#543)

* Support all currencies, handle outside DB

* Remove currencies from seed

* Fix account balance namespace

* Set default currency on authentication

* Cache currency instances

* Implement multi-currency syncs with tests

* Series fallback, passing tests

* Fix conflicts

* Make value group concrete class that works with currency values

* Fix migration conflict

* Update tests to expect multi-currency results

* Update account list to use group method

* Namespace updates

* Fetch unknown exchange rates from API

* Fix date range bug

* Ensure demo data works without external API

* Enforce cascades only at DB level

app/views/pages/dashboard.html.erb

@@ -10,7 +10,7 @@
         <%= render partial: "shared/balance_heading", locals: { 
             label: "Net Worth", 
             period: @period,
-            balance: Current.family.net_worth_money,
+            balance: Current.family.net_worth,
             trend: @net_worth_series.trend
         } 
         %>
@@ -26,7 +26,7 @@
           <%= render partial: "shared/balance_heading", locals: { 
                 label: "Assets",
                 period: @period,
-                balance: Current.family.assets_money,
+                balance: Current.family.assets,
                 trend: @asset_series.trend 
             } %>
         </div>
@@ -44,7 +44,7 @@
                 label: "Liabilities",
                 period: @period,
                 size: "md",
-                balance: Current.family.liabilities_money,
+                balance: Current.family.liabilities,
                 trend: @liability_series.trend
             } %>
         </div>