Remove std::cout calls

The TRT_ConditionsData package contains data classes with many calls to std::cout. These calls are all replaced by MsgStream calls, except in functions called print, dbg or the like. At the same time, 3 unused classes are removed and the package documentation updated.

This merge request affects 2 packages:

• InnerDetector/InDetConditions/InDetConditionsAthenaPool
• InnerDetector/InDetConditions/TRT_ConditionsData

added InnerDetector master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-23345-2019-05-11-06-02
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 38320]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 30810284

added sweep:ignore label