Hallo Heinz,
Original EPICS Base (the "classic" modules) are on Launchpad.
New PVA modules (formerly "V4") are on GitHub.
It's been that way for a while, and currently we are not planning to change.
I just added you to the C++-devs group of the epics-base organization. Now you can.
Please do not push merge proposals to the epics-base master repo.
Instead, push merge proposals to your own repo, either in you personal Launchpad area (only you can push to it) or in the epics-base area (all epics-base members can push to it).
E.g. (using the second option)
Pull-URL (no authN, read-only):
Push-URL (authenticated, read/write):
Then (using the web interface) browse to the branch you want to propose, and create the merge proposal (make sure to direct it to the right branch in the epics-base master repo).
HTH,
~Ralph