[WIP] account_voucher removal
[WIP] accont_voucher: removal of payments in account.voucher
[WIP] account_voucher: removal of everything related to payments
[FIX] account_voucher installation after removal of all features related to payments
[IMP]Migrat account.voucher,postgre report into new api, and removed unused stuff for payment from invocie.py.
[FIX]Fixed traceback related voucher_type field.
[IMP]Improved sals and purchase receipt,voucher line view and fix todo for price_subtotal.
[FIX]Fixed compute tax method for compute taxes on lines.
[FIX]Fixed error in yml test cases.
[IMP]Improved some code and removed unused py file.
[FIX] account_voucher : Fixed the 'instancemethod' object is not iterable.
[FIX] account_voucher : Fixed the _check_paid() method.
[FIX] account_voucher : Fixed the various methods.
[FIX] account_voucher : Removed the 'basic_onchange_partner' method and implemented the logic in 'onchange_partner_id' method.
[FIX]Fixed compute_tax method.
[REM]Removed account_voucher_view.xml from account_check_writing.
[IMP]Todo: Improve yml test case in account voucher.
Merge pull request #65 from odoo-dev/master-account-new-api-voucher-removal-qdp

Account voucher migrate new api.