* QString::number use scientific format, si it's invalid for numbers > 1 000 000. We need to use v.sprintf("%d");
* Accounts and categories where badly mapped during import
* Fix cost not taken in account during import
* Forbid empty account name and empty category name
Change import/export engine filter to Qt format
Qt doesn't add extension in its file dialog
Fix a bug : op was not correctly set by default in OnOperationModified (GridAccount)
