Fix BiTAC_sp memory allocation

[KevCaz]

My PR includes 2 commits:

• the first one remove .DS_Store files and .Rhistory. .DS_Store are in the .gitignore but once they are tracked they need to be removed explicitly (https://docs.github.com/en/get-started/git-basics/ignoring-files).
• the second fix the bug detailed in the following Google group thread: https://groups.google.com/g/atlantis-ecosystem-model/c/gNJN6AXaM88, the way the allocation is done does not match the way BiTAC_sp is used. For instance:

  AtlantisTrunk/atlantis/atmanage/atManage.c

  Line 2382 in 9f99af0

  bm->BiTAC_sp[bim][nreg][sp][now_id] = 0.0;

  shows that the second dimension is nreg, but the allocation used the number of species for the second dimension.

Given that the way to contribute is not established yet, I understand my changes may not be integrated, but I thought it was easy enough to do the PR since I have access to the code!

[andybeet]

@KevCaz Thanks for this. We are a little behind in organizing and establishing protocols. We had a workshop in September that helped us focus on the repos needs. Hopefully we will speed things up. Either way, this should be a PR into dev

[eafulton]

Fixed the issue with Util_Alloc_Init_4D_Double instead

[eafulton]

Guessing someone needs to cross check/review the change I made before it can have a final merge and close?

[andybeet]

yes @eafulton. I added @cecilieha as the second reviewer

[cecilieha]

I've run the original code and this one, and compared all variables for the first 100 timesteps (using NoBa); there are no differences between the two, the outputs are identical.