Tagged release v3.6.0

65178c1 Add dictionaries for railwayCargo validation
1728edf Remove _lastModified field
d12837e Update tenderAttempts validations
19105ad Add possibility to change minNumberOfQualifiedBids for railwayCargoEnglish
08f5149 Add unicCode classifier
8db928d Minor base models update
1588e95 Update import roles
466e95b Remove accessDetails from required fields
0a76c34 Change tenderAttempts validation
40bc756 Update railwayCargo fields
06b8b32 Change additionalIdentifier type to list
ebc87bc Fix validation errors
ad773bd Remove timber and nadra sellingEntity models
ef490f0 Add tests for classifiers validation
e125698 Add timberDiameter classifier
ea74f47 Add releted classifiers validation
485ceac Add the timberLength classifier with validation
471e875 Update timberEnglish qualification flow #367
d5dbab7 Add check that qualification came valid bids for timber and nadra #405