[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.
[imp]:converted yml testcase to pyhton testcase
[imp]:converted yml testcase to pyhton testcase
[imp]:converted yml testcase to pyhton testcase