the Monitoring/View code was completly dropped in favor of
the DataView implementations, as new Backends otherwise
would require to implement two seperate query logics
refs #3801
The constructor of the class is now private, instantiation happens
with Url::fromRequest and Url::fromPath. Also updated all occurences
of Url and fixed the Qlink helper to not overwrite the baseUrl with null
values
refs #4381