[IMP] account : Improved the code and also removed unwanted code.
[FIX] account : Fixed the 'account.config.settings' object has no attribute 'start_date'.
[imp]:improve report old api to new api
[imp]:convert report old to new api
[imp]:improve code
[imp]:improve code
[imp]improve string attributes
[imp]:remove unused import
[imp]:improve read_group method
[imp]:remove unused code