add capability to dump payloads, tags, gts in XML format. First version with dynamically compiled code
cleanup leftovers
add testfile and test as an example in RunInfo
Merged refs/pull/6673/head from repository cms-sw
fix build errors in PhysicsToolsObjects
Merge pull request #6673 from apfeiffer1/apPayload2xml

add capability to dump condDBv2 payloads, tags, GTs in XML format