Add comparison capability to RadMon regional web sites.

[EdwardSafford-NOAA]

This PR adds a comparison capability to RadMon regional web sites in a similar fashion as is done for global sites.

When running Install_html.sh the user is asked if they would like to enable comparison plots, and if so, what source should be used for the comparison (the default is the operational NAM). If enabled comparison plots are enabled in the summary and time series plots.

A working example built during testing can be seen at https://www.emc.ncep.noaa.gov/gmb/gdas/radiance/esafford/regional/testz/ .

Additionally some unrelated modifications to the plot_time.html.glb were made to fix these problems:

• disclaimer location was moved so it would not over lay part of the menu on left
• the labels for omgbc and omgnbc were corrected to read "Obs - ges|anl ..." instead of "ges|anl ... - Obs"

Note that the result of the Install_html.sh script is that the customized html and other web files are placed in the user's $TANKDIR/imgn/regional/$SUFFIX directory. A manual transfer of these files to the web server is required. An automatic transfer mechanism will be added in a separate issue.

Closes #157

[xyzemc]

There is no test plot showing on this link https://www.emc.ncep.noaa.gov/gmb/gdas/radiance/esafford/regional/testz/. Should I expect to see the figures?

[EdwardSafford-NOAA]

I just linked in data from the NAM for testing purposes and those links aged out. I just updated the data and the summary plots are working. I'll update the links again on Monday. The time series data is still available, but I'll have to update that by Monday as well.

[EdwardSafford-NOAA]

@xyzemc I updated the data this morning. For the summary plots if you switch on NAM data (top left check box) you'll see that comparison data overlaid. Since I'm using NAM data and calling "testz" the curves will be the same but the comparison plot is done last, so you'll see the curves change colors indicating the inclusion of the NAM data. For the time series there is a little bit of mismatch because the data I pulled over this morning hasn't been updated while the current NAM data has been updated. That means there will be some cycles at the left end of the plots that the comparison data doesn't match and will be zeroed out. Hope that makes sense. Anyway, please have a look when you have a moment. Thanks.

[xyzemc]

@xyzemc I updated the data this morning. For the summary plots if you switch on NAM data (top left check box) you'll see that comparison data overlaid. Since I'm using NAM data and calling "testz" the curves will be the same but the comparison plot is done last, so you'll see the curves change colors indicating the inclusion of the NAM data. For the time series there is a little bit of mismatch because the data I pulled over this morning hasn't been updated while the current NAM data has been updated. That means there will be some cycles at the left end of the plots that the comparison data doesn't match and will be zeroed out. Hope that makes sense. Anyway, please have a look when you have a moment. Thanks.

It looks good for me now. I will approve this PR. Thanks!

[xyzemc]

Should we change 'NAM' to 'RRFS' when RRFS becomes the operational system and replace NAM?

[EdwardSafford-NOAA]

Yes, absolutely. The default comparison should always be the operational regional model, as the default global is GFS and will need to be changed to its successor(s). I should move the declaration of cmp_src to the top of the file so it's easy to find and replace. I'll go ahead and do that. You might have to re-approve the PR again after I make those changes.

[EdwardSafford-NOAA]

I've updated install_glb.sh and install_rgn.sh scripts to place the default values at the top of each file and de-referenced them with variables. That will make updating them in the future more straightforward. Please take a look if you have a chance. I've re-tested the website builds and the scripts are working as intended.