Support climatology files

[neishm]

Example: /home/smco815/ss5/constants/climato_phase2/clim_gemdm320_1080x540_v2_de_francois_withiceline_i8_glorys1v1.0_corr_EMIB

These files use "ip2" to distinguish the months, with values from 1 to 12. The actual time stamps are arbitrary and should be ignored.

I love this file format!