Use same cloud water for radiation and COSP.

[brian-eaton]

Issue #1027 - Radiatively active cloud water missing from COSP.

The all-cloud liquid and ice mixing ratios calculated in the conv_water module are used by the radiation code. Use these same mixing ratios in the COSP code by making them accessible via the physics buffer.

Only COSP diagnostics will have answer changes.

resolves #1027