Add CSV exports to print toolbar
From https://discuss.tryton.org/t/add-a-shortcut-in-the-toolbar-for-csv-export-and-a-list-of-predefined-exports-like-for-the-reports/1114
The exports are a frequent tools from some users so make it more accessible will speedup their usage.
The proposal is to display them under the print toolbar (as it is a kind of document).