Moved cooling unit test to tests/. cleaned up cooling box example

Makefile.am

examples/CoolingBox/Makefile.am

examples/CoolingBox/README

examples/CoolingBox/analytical_test.py

examples/CoolingBox/coolingBox.yml

examples/CoolingBox/coolingBox_non-cosmo.yml

examples/CoolingBox/coolingBox_primordial.yml

examples/CoolingBox/coolingBox_solar.yml

examples/CoolingBox/cooling_box_test.c

examples/CoolingBox/cooling_rates_plot.py

examples/CoolingBox/getGlass.sh

examples/CoolingBox/makeIC.py

examples/CoolingBox/test.sh

examples/CoolingBox/testCooling.c

examples/CoolingBox/testCooling_cool_part.c

examples/CoolingBox/test_script.sh

examples/SmoothedMetallicity/run.sh

tests/Makefile.am