Update gaea port

[apcraig]

Recommend the following changes.

• cice.batch.csh should not have hard-wired account. These are normally set by the env file, .cice_proj, or --acct on the cice.setup command line.
• remove -xHost from CFLAGS, add -march=core-avx2
• comment out debug output from env files
• change the default queue from windfall to normal for gaeac6.
  • normal is going to be what we want in the long term
  • windfall is almost unusable now as jobs wait for a long while in the queue and you can only have 2 jobs queued at a time
  • users can specify "cice.setup --queue windfall" in the short term as needed

I have tested these on gaea. gaeac5 works fine, I have nggps_emc set in my .cice_proj file. I have confirmed gaeac6 builds and submits fine with "cice.setup --acct sfs_emc --queue windfall". I have two test jobs waiting in the queue.