Add a set_env.py line for COVERAGE_DEBUG
Add a set_env.py line for COVERAGE_DEBUG

nedbat/coveragepy,hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy,nedbat/coveragepy,nedbat/coveragepy,hugovk/coveragepy,hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy