* QueryReport
- Only print visible columns in report
- Use get_columns_for_print method instead of directly
accessing report.columns
* Query Report
- Replace frappe.query_report_filters_by_name with new API
* fix in query incase list is empty
* periodicity not found error
when called from consolidated financial statements and custom cash flow is activated
* unset currency filter to apply default currency or so
* python 2 - 3 fix
