[IMP/FIX]bug fixes,improvments and new features in account_asset module

[IMP]Used date field instead of purchase_date in report.

[IMP]Simplified some code,remove unused code and some comments.

[REM]Remove misc code.

[IMP]Used datetime.replace to manipulate date,improved code.

[IMP]set a parent menu for Recognition Entries same as Asset Entries

[IMP]assign direct key into copy method for name.

[IMP]Improved code as per Pep8.