CMakeLists.txt deals more cleanly with pele include directory
add some commentes to mc.cpp

also, remove some of the unnecessary nesting in one_iteration
use the correct include directory in the cpp tests

use source/, not source/mcpele.  Then you include with
"#include mcpele/mc.h"
add a test for CheckSphericalContainer
add a test for EnergyWindowTest
clean up EnergyWindowTest
Merge branch 'master' of github.com:pele-python/mcpele into update_pr2_new
Merge remote-tracking branch 'origin/master' into test_updates
Merge pull request #4 from js850/test_updates

Test updates