Total Amount and Count for Financial Batches

We don't think users will consistently know how many / which transactions are unassigned when starting an new batch.

1. Change the Count (item_count) and Total Amount (total) fields on New / Edit Financial Batch form to OPTIONAL.

2. Close (or Close + Export) action;
2.1 If batch.item_count and / or batch.total are not null, compare to actual assigned aggregates
2.2 If aggregate =! batch row data, notify user and allow them to continue or cancel the action (see Bulk Entry code for example).
2.3 Close action should always update both columns in batch table to reflect actual assigned count and total.