[FIX]Fixed issue for date_account field,fisclayea find method

[REM]Removed stuff for state field of account.move.line.

[IMP]Improved help string and remove domain.
[IMP]Improved code for serach fisclayera
[FIX]account: Fix validation of invoice problem.
[WIP] account: implementing changes from master-reconciliation-and-statement-import-ama
[WIP] account: implementing changes from master-reconciliation-and-statement-import-ama
[FIX] account : Fixed the invalid syntax in field defination.
[FIX] account : Fixed the invalid syntax in return statement.
[FIX] account : Fixed the 'module' object has no attribute 'boolean'.
[FIX] account : Fixed the cannot import name expression.
[FIX] account : Fixed the cannot find model in view defination.
[FIX] account : Fixed the global name 'valid_moves' is not defined.
[IMP]account: account_test_users.yml
[IMP]account: convert to account_test_users in py test case.
[IMP]account: create a new customer_invoice test file.
[IMP]account: improved customer_invoice yml.