Use git tag --contains REV for the IDF_Scm::inTags() implementation.

This works similar to git branch --contains REV; additionally give the
revision id and not some possibly symbolic name to the inBranches()
call when we determine the branches a commit is in.

NEWS.mdtext

@@ -52,6 +52,7 @@
 - Disable browser autocomplete of password fields in the account settings (issue 616)
 - Improvements in the automatic linker parser (issue 618)
 - The `createIssue` API method did not check the API authentication (issue 619)
+- Print active git branch heads and tags in bold 
 
 ## Documentation