version 1.6.0

[DenBond7]

• check and organize closed issues. They should fit the milestone.
• write customer
• build release
• release consumer 20%
• release enterprise in 2 weeks

Diff between releases
1.5.9...1.6.0

[DenBond7]

Release notes:

• Modified password-protected messages compliance
• Internal improvements

[DenBond7]

Superseded by #2910