[JENKINS-59021] Calculate diff against any other cppcheck result#50

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strandlie wants to merge 2 commits intojenkinsci:masterfrom

strandlie:master

Commits on Aug 21, 2019

Made it possible to specify baseline to compare diff against, and also removed some transient definitions to fix JENKINS-55549.
Håkon Strandlie
committed
Fixed bugs found by SpotBugs analysis. No longer fixes JENKINS-55549
Håkon Strandlie
committed