fix: correct capitalization metBiGGID

[edkerk]

Main improvements in this PR:

Fix:

• Correct capitalization of metBiGGID field for model conversion.

I hereby confirm that I have:

• Tested my code on my own machine
• Followed the development guidelines.
• Selected devel as a target branch
• If needed, asked first in the Gitter chat room about this PR

[BenjaSanchez]

@edkerk I was curious as to why this was not a problem in my setup before, and realized that because the name of the file COBRA_structure_fields.csv is the same in RAVEN as in COBRA, ravenCobraWrapper was calling the file in COBRA instead of the one in RAVEN (generating no error). Why have this duplicity? If we don't want to rely on needing COBRA installed for using the wrapper, then I would suggest changing the name of the file, to avoid more mishaps.

[simas232]

@BenjaSanchez, @edkerk, we may have a function which checks if COBRA toolbox is available in MATLAB pathlist, e.g. isCOBRAInstalled. It is very likely that we would need this function in more situations than this.

[edkerk]

@BenjaSanchez Good questions. The file is supposed to be exactly the same as the one from COBRA (I missed that I manually changed metBiGGID when I added the file here, and the reason I didn't notice this is indeed because of your explanation).

The reason to distribute the same file with RAVEN is indeed to prevent reliance on COBRA for ravenCobraWrapper (one might want to get the annotations in metBiGGID format instead of metMiriams). Why do we use the exact same file with the same file name? When RAVEN is starting to function as submodule in COBRA (#184), but there is still a need to move between model formats, then we can just directly rely on the COBRA-distributed file and remove the RAVEN-distributed version.

Nonetheless, I don't like to take files from the MATLAB path if there is a risk that there could be multiple files by the same name. I'm therefore refactoring ravenCobraWrapper to specifically use the RAVEN version.

@simas232 Good suggestion, but I don't think it's required here.