WIP: Add coverage analysis to cmake builds

Stefan Kluthrequested to merge
skluth/atlasexternals:master-coverage into master

Add -DATLAS_TEST_COVERAGE:BOOL=TRUE cmake option to have a build with coverage enabled. Run tests (make test). Then use targets like "make Package_<packagenanme>_coverage" to generate the coverage report html files. ToDo: collect individual per-package coverage report generation under target "make coverage" to generate all reports

Edited by Frank Winklmeier

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