Add IFI regression tests to UPP rt.sh

[SamuelTrahanNOAA]

The UPP regression test for libIFI must be added to the UPP rt.sh so libIFI developers can test the UPP.

Recently, I created regression tests for IFI. This adds one step to one of the regression tests, to run libIFI's standalone test program and compare its output to the UPP's IFI output. I gave this to Wen Meng several weeks ago, and I can provide it again to anyone who requests it.

It consists of these changes:

1. rt.sh must have an option which sends -I to compile_upp.sh and enables the IFI test.
2. A new run script for the new UPP test: /scratch2/BMC/ifi/Samuel.Trahan/fip/regtest/UPP/submit_run_post_rrfs_ifi_internal_hera.sh
3. A new run script for the libIFI standalone test program: /scratch2/BMC/ifi/Samuel.Trahan/fip/regtest/UPP/submit_run_ifi_standalone_hera.sh
4. A script to compare the UPP IFI output to the libIFI standalone test program output: /scratch2/BMC/ifi/Samuel.Trahan/fip/regtest/UPP/compare.sh

Whoever does this must be approved for access to the libIFI source code, which is closed-source by request of its owner.