Add test for Anomaly forcing and rename test for bias correction

[ekluzek]

Right now our test that's labeled "af" for anomaly forcing is actually a bias correction test (test mod af_bias_v7). This should be changed to be labeled "bc" for bias correction. And a new test added that's actually testing the anomaly forcing.

[ekluzek]

Note, #1386 relates to this.

[billsacks]

One idea: put these tests in a cdeps test list (since they're actually testing cdeps code), but then also have copies in our clm_science test list.