Add autotool support for generating coverage reports.
configure checks if you have lcov & genhtml; these can be specified with --with-lcov and/or --with-genhtml. If they are available, then make coverage does the following: - make clean, then make check with CC=gcc & CXX=g++, and CFLAGS && CXXFLAGS set so that inputs for gcov/lcov are generated. - lcov creates the src/coverage subdir and generates a targetfile there. - genhtml generates HTML reports in src/coverage.
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