Add time period to output file

[gold2718]

Currently, monthly and yearly files indicate the time period in their filenames.
However, when using the --merge-all option, the resulting date range is not included.
This information should be added to the compressed output files.
Noted by @lisesg

[gold2718]

@lisesg ,
What is a good format for the date range?

<case>.<component>.<href>.yyyy-mm-dd_YYYY-MM-DD.nc   ?

<case>.<component>.<href>.yyyy-mm-dd_to_YYYY-MM-DD.nc   ?

Something else? Here:

• yyyy-mm-dd is the earliest date on an input file
• YYYY-MM-DD is the latest date on an input file
• <case> is the usual case name prefix (<compset>_<res>_<casename>)
• <component> is the component name (e.g., cam, blom)
• <href> is the history file number (e.g., h1, hbgcd)

[lisesg]

I suggest to follow the same conventions we use for the substring in the daily CMIP6/CMOR-ized filenames that indicate the start and end dates, so something like:

<case>.<component>.<href>.yyyymmdd-YYYYMMDD.nc

And for experiments run using the multi-instance component:
<case>.<component>.<href>_<member>.yyyymmdd-YYYYMMDD.nc

(I added an underscore instead of a dot between <href> and <member> because this is in line with the default naming conventions of the raw model (time-slice) output. )