WHM observations where mismatch of climr vs BGC require review

Various issues where climate summaries by BGC indicate potential problems - either in climr or in BGC mapping
1. ICHmm in Robson Valley has very low CMD.total. It's likely that the rainshadow of the Premier range is not captured.
2. Coast transition subzones like IDFdc have lower CMD than expected. Suspect that rainshadow effect in model is not sufficient
3. CMD calculation. Proper balance of temp vs precip in equation? Cold dry subzones vs warm wet subzones = same CMD. Not ecologically equivalent.

The issue names no files or tests. Start by reproducing the climate summaries for ICHmm in Robson Valley and IDFdc, then trace CMD.total, the BGC mapping, and the rainshadow and temperature-versus-precipitation calculations. Done means the mismatches are explained and the required correction is defined.

Written by the indexing model from the issue text.