[ADD] examples of journal entries

* interaction is terrible, select is ugly but radio buttons take way too
  much vertical space, no matter whether they're on the left or the
  right
* may be possible to unify operations lists between chart of accounts
  and entries? Not currently selected set, just the list of possible ops

conf.py

@@ -272,4 +272,4 @@ def setup(app):
     app.add_javascript('react.js')
     app.add_javascript('accounts.js')
     app.add_javascript('chart-of-accounts.js')
-    app.add_javascript('fiscalyear.js')
+    app.add_javascript('entries.js')