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Sonar scans haven't been working properly for a while. It turned out that changes in our travis build script were responsible - apparently the sonar build wrapper doesn't work incrementally, so we must build all to-be-scanned targets in one go instead of sequentially.
Also made some other improvements to the travis script, most noteworthy is that the sonar stuff will no longer fail the build. This should lead to fewer red flags, but we may have to trigger rebuilds sometime to actually see the sonar results.
Also fixes sonar target branch detection (more precisely, makes the target branch explicit for develop/hardfork, which will require an additional change when merging to hardfork).