Change variable names to reduce ambiguity for interpretation and aid useability.

Pull through variable name changes and renaming of functions to aid legibility and clarity. Introduced some additional debug print statements.

Add documentation about the location of the gridded climatology files for SEEPS and which environment variable to use.

…ling in pair_data_point.cc

…d revisiting the volume of SEEPS-related Debug log messages and reducing them once its fully tested.

….nc file name. Rename as _v12.0.nc for the updated version with the new names so that the existing regressions tests and nightly builds for main_v11.1 and develop continue to work. We can remove the _v12.0 once this feature branch is merged into develop but for the time being, we need both versions to exist.

… to the more descriptive ODFL, ODFH, OLFD, OLFH, OHFD, OHFL names.

… like the SEEPS score itself so that they're handled in a consistent manner. Note however that it's hard-coded to NOT write the weighted means/score, only the unweighted ones.

…ean_fcst and mean_obs values.

…id of compiler warning message.

…loat and double inputs to satisfy compiler pb2nc compiler warnings.

…utput .stat file.

…ialized vectors.

…on number from the gridded SEEPS climo file name ci-skip-all