fixes #6749 - fix API v2 examples in docs that show error messages by re-ordering functional tests

fixes #5178 - unify API parameters and return values. User creation should not require payload wrapped with 'user' root

fixes #4155 - enable host/CR (dis)association via api

Fixes #6532 - permission related api extensions

- usergroups#show lists associated roles
 - listing available resource types
 - filters#show lists associated roles
 - filters#index lists associated roles and permissions and orders the results
 - pagination in permissions#index...

Fixes #6285 - Settings API does not parse incoming values to correct data type

fixes #3272 - allow 'admin' account to be removed and replaced

fixes #6248 - API V2 return object for POST/PUT/DELETE should not include root node

fixes #6216, #4416 - avoid foreign key errors when deleting some objects in use

fixes #6229 - validate installation media exists for new host if pxe_build

fixes #6003 - don't render user default loc/org object directly