This update for tryton, trytond, trytond_account fixes the following issues:

Changes in trytond_account:

- Version 6.0.13 - Bugfix Release

Changes in trytond:

- Version 6.0.21 - Bugfix Release

Changes in tryton:

- Version 6.0.17 - Bugfix Release

- Version 6.0.16 - Bugfix Release