BUG fixes: sediment alkalinity and sediment C14

[jmaerz]

Dear @TomasTorsvik and @JorgSchwinger , I herewith open the pull request linked to issue #193. In addition to the described alkalinity issue, it seemed to me that there was an additional bugfix for C14 needed - please re-check carefully. This branch hasn't been checked on betzy yet, but compiled successfully locally. I left the rest of the isotopes untouched (didn't introduce sulf13 and sulf14, respectively, since it wasn't needed from a bug fixing perspective, while it breakes the consistency between anaerob and e.g. anaerob13). If you wish to introduce sul13,14 for more consistency, let me know. closes #193

[JorgSchwinger]

This looks good to me (I trust that this is now consistent with the water column code - I haven't checked this myself). Regarding the isotope part: it would be good to aim for a version of the code that runs with C-isotopes in the sediment enabled (wasn't done so far). Therefore I would vote for including sulf13/14 in this fix.

[jmaerz]

Hi @JorgSchwinger , the sulf13,14 is not a requirement to enable running the C-isotopes in sediment - it would only increase readability (the reflection of sulf by sulf13,14 - so introducing it would/should not change the result for the isotopes) - I wasn't introducing it for sake of less memory usage thus far, but I also would be in favor to introduce it. I'll introduce it early next week.

[JorgSchwinger]

Ok, I see. For the C-isotope code, the philosophy was to reflect every relevant line in the C12 code by one corresponding line in the C13/14 code. So I agree, I would also be in favor of introducing sulf13/14 even if it's not strictly necessary.

[jmaerz]

Ok, thanks for that feedback and valuable information! I'll take care of it beginning of next week.

[TomasTorsvik]

Looks fine, no complaints from my side