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MdtCondAlg: Use addDependency instead of verbose and error-prone manual handling of IOV-Ranges

Walter Lampl requested to merge wlampl/athena:MdtCondAlg_addDep into master

MdtCondAlg: Use addDependency instead of verbose and error-prone manual handling of IOV-Ranges

While testing, I noticed that this cond algo gets executed 5 times in 25 events of q431, with and IOV shorter than one second, fired by the IOV of /MDT/DCS/HV. That implies that the entire conditions object get recreated. Is this really necessary? Wouldn't it be more efficient to split the frequently-changing DCS part into a separate conditions object and algorithm?

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