UV-CDAT 2.12

allow runt_test to be killed with Ctrl+C (#243)

* allow runt_test to be killed with Ctrl+C

* corrected english (such a difficult language)

* trying w/o the -n

* no need to downgrade conda anymore

* ok we need a -n

* 1 for circleci ?

* Somehow picks up wrong mesa

* Update circleci_mac.sh