Add more missing std qualifiers and includes of iostream header

[wmtan]

After moving from working with CMSSW_7_0_0_pre3 to working with CMSSW_7_0_0_pre4, I discovered several more packages that would not compile against ROOT6 because of missing std qualifiers or missing includes of iostream. This purely technical request fixes those packages. In one place, I also changed two includes of ROOT headers to use quotes instead of angle brackets, as they are not system headers.

Please bypass signatures, as this is purely technical.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_0_X.

Add more missing std qualifiers and includes of iostream header

It involves the following packages:

IOPool/Streamer
PhysicsTools/FWLite
MagneticField/ParametrizedEngine
Alignment/OfflineValidation
CalibTracker/SiPixelGainCalibration
DataFormats/FWLite
CondTools/Ecal
CondCore/RPCPlugins
DQM/BeamMonitor
CalibCalorimetry/EcalCorrectionModules

@apfeiffer1, @Dr15Jones, @demattia, @danduggan, @rovere, @thspeer, @rcastello, @deguio, @slava77, @ggovi, @vadler, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@ktf you are the release manager for this.

[Dr15Jones]

+1