removed unnecessary functions, added comments, added READMEs to examples

examples/CoolingBox/analytical_test.py

examples/CoolingBox/makeIC.py

examples/CoolingRates/testCooling.c

examples/CoolingRates/testCooling.yml

examples/CoolingTest_Alexei/Makefile.am

examples/CoolingTest_Alexei/plots.py

examples/CoolingTest_Alexei/plots_nh.py

examples/CoolingTest_Alexei/testCooling.c

examples/CoolingTest_Alexei/testCooling.yml

examples/CoolingTest_Alexei/testCooling_messy.c

examples/CoolingTest_Alexei/testCooling_script.c

src/cooling/EAGLE/cooling.c

src/cooling/EAGLE/cooling.h

src/cooling/EAGLE/cooling_read_table.h

src/cooling/EAGLE/cooling_struct.h

src/cooling/EAGLE/eagle_cool_tables.c

src/cooling/EAGLE/eagle_cool_tables.h

src/cooling/EAGLE/interpolate.h

tests/Makefile.am

tests/plots.py