[FIX] mail_tip: prevent blank webclient
[imp]:crate a view for expense or add field in expense line
[Add,imp]:Remove expense 'sheet' concept

[rename]:Rename module hr_expense to expense

[rename]:rename obejct hr_expense_line to expense and hr_expense_expense to expense_sheet

[imp]:improve code

[imp]:hr manger approved expense only generated accountant enteries

[imp]:add a field in view or improve code

[imp]:improve tax calculation and view

[imp]:add a menu in more button and manage a workflow's

[imp]:improve view and add a web tip on more button

[rem]:remove unused field

[imp]:improve expense related modules

[Add,imp]:add a python test case

[imp]:improve demo data and test case

[imp]:improve demo data

[imp,rm]:improve python test case and remove yml test cases

[imp]:improve qweb report and hr config settings

[imp]:improve hr_expense to expense related modules

[fix]:fixed on unlink method

[imp]:improve python test cases and view

[fix]:fixed on reconcile def or improve @api.onchange decorator

[imp]:improve @api.onchange decorator

[imp]:remove unused code

[imp]:remove unused parameter