CaseClass can look beyond /glade/scratch/mlevy

[mnlevy1981]

Added three new variables to CaseClass.__init__() API:

1. run_root: treats {run_root}/{casename}/run as $RUNDIR (looks for log files
   and history files there)
2. archive_hist_root: Looks for archived history files in
   {archive_hist_root}/{casename}/{component}/hist
3. campaign_root: Looks for time series output in
   {campaign_root}/{casename}/output/{component}/proc/tseries

The default values for all three of these are None, which implies "don't even
look for files in these directories." Ideally a future update will provide the
user some configuration method for setting the defaults. Given these defaults,
every notebook needed to be updated to include at least one of those three
variables when creating the CaseClass object.

I also created two notebooks showing how we can look at the 1 degree run with
this new set-up. Currently we have history files for years 95-104 on campaign
so plot_suite_1deg.ipynb looks at that decade of output while
plot_suite_maps_0095_1deg.ipynb shows plots for the first year of data.

We now have 14 years of 004 output in campaign, so I updated
plot_suite_004.ipynb to look at all 14 years instead of just the first 5. I did
not modify trend_maps.004.ipynb or run plot_suite_maps for any additional
years of 004.