Edge case for names of variables

[kmdeck]

A variable name of the form "x_1m" e.g. will fail here:

julia> short_name = short_names[1]
"iwc_1m"

julia> var = get(simdir; short_name)
ERROR: Variable iwc_1m not found. Available: Set(Any["si", "et", "trans", "swc", "ct", "msf", "lwp", "swu", "swe", "iwc", "gpp", "lwu"])

even though the file (iwc_1m_1M_average.nc) is present. This may because the code assumes "_1m" refers to the time interval of a minute.

[ph-kev]

The bug lies in match_nc_filename. It is non-obvious to me how to fix this because iwc_1m_1M_average.nc can be interpreted as a variable having a period of one minute and one month if iwc is the variable name or a period of one month if iwc_1m is the variable name.