qdoc3: qdoc now creates output subdirectories
qdoc3: qdoc now creates output subdirectories

Now it also corrects the headerstyles and
headerscipts strings by prepending "../"
to each reference to style/something
and scripts/something.

Task-number:  QTBUG-22244
Change-Id: I6ed11b0a77167dc4ee04b4c865a153eb6337eb4b
Sanity-Review: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Casper van Donderen <808524cef5c654648bea2a2b954f3b3445ed083c@nokia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc