NXP-12461: create relation tab subpage plus convenient method
NXP-12461: add access to relations tab sub page
NXP-12461: add simple test on relation beween 2 documents
NXP-12461: fix suggest document select2 widget id
NXP-12461: complete relations test
NXP-12461: add log warn for Jenkins debug
NXP-12461: wait for select2 ajaxReRender and make sure validation has no null param