Port to Hercules

[DavidHuber-NOAA]

This ports the gsi-monitor to Hercules and resolves #101.

Only a test build has been performed at this point. I will be starting a global workflow cycled experiment shortly, which will test the data extraction programs. Plotting routines can be run after a few cycles have completed.

[DavidHuber-NOAA]

I am having trouble with the minmon on Hercules. It seems the MoreUtils library is not installed on the system, which is required by global-workflow/ush/minmon_xtrct_gnorms.pl. I have requested that this library be installed.

[DavidHuber-NOAA]

@EdwardSafford-NOAA I am requesting a number of Perl modules to be installed on Hercules that appear to be used in gsi-monitor:

List::MoreUtils
Date::Calc
FileHandle
Arch_utils
FindBin
Manipulate_time
Math::Trig
Recd_State
Remote_utils
Time::JulianDay
XML::LibXML
XML::Simple

Do you know if any of these are no longer needed?

[EdwardSafford-NOAA]

The only ones on the list that I can confirm are still used in gsi-monitor are:
List::MoreUtils
Date::Calc
Math::Trig

The two XML modules and FileHandle I recognize as once having been used, but the rest are not familiar to me at all.

[DavidHuber-NOAA]

Following the installation of the required Perl modules during the last maintenance period on Hercules, I have tested this out within the global workflow on Hercules and it works for data generation.

[EdwardSafford-NOAA]

Looks good to me. Thanks for working on this!