Request for Recursive Warnings as Message DUB Flag

[Nordlöw]

I really think DUB lacks an important flag/option namely a 
variant of

    allowWarnings
that *recursively* affects all the sub packages of a dub.json 
project description.

Otherwise developers who want to try out D will think its is 
broken because of warnings such as deprecated use of C-style 
arrays hinders them from building and trying out all the cool 
software currently packaged with DUB.

I don't think D's deprecation system was meant to have this 
affect on the developer.

Comments on that, please.