Merge pull request #521 from EricpolUkraine/master

Release merge v1.15.4.0
Fixed three unit tests dependent on current date
Merge pull request #522 from Bohdan-Tereta/development

Fixed three unit tests dependent on current date
Issue #517 completed.
Merge pull request #524 from nazariitashak/development

Issue #517 completed.
Issue #527 fixed
Merge remote-tracking branch 'upstream/development' into development
Merge pull request #528 from Bohdan-Tereta/development

Issue #527 fixed
Issue #500 completed.
Merge pull request #529 from nazariitashak/development

Issue #500 completed.
Fixed issue #487
Merge remote-tracking branch 'upstream/development' into development
Merge pull request #530 from Bohdan-Tereta/development

Issue #487 fixed
Issue #518 fixed
Merge remote-tracking branch 'upstream/development' into development
Merge pull request #531 from Bohdan-Tereta/development

Issue #518 fixed
Unit tests for BTM and VU fixed
Merge remote-tracking branch 'upstream/development' into development
ABM\CalendarTests were fixed.
Merge branch 'development' of https://github.com/EricpolUkraine/Ajour into development