feat: speed up getKEGGModelForOrganism

[edkerk]

Main improvements in this PR:

• refactor:
  • speed up getKEGGModelForOrganism when renaming gene names from KEGG.
• feat:
  • allow getKEGGModelForOrganism to take a globalModel structure containing model and KOModel output from getModelFromKEGG as preload, to speed up generating many models for different species.

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

[edkerk]

When running getKEGGModelForOrganism many times for different species, it would speed up to take a preloaded global KEGG model as input, instead of running getModelFromKEGG with each iteration. Example of its use in tutorial6:

[globalModel.model,globalModel.KOModel] = getModelFromKEGG;
ScoKEGGHomology=getKEGGModelForOrganism('ScoKEGGHMMs','Sco_all_protein.faa','prok90_kegg94','',1,0,0,0,10^-50,0.3,0.8,inf,inf,-1,globalModel);

Note that all other parameter values now also need to be given as input (and here the default values are given). It is not the most convenient, but left this way as it will not be run as such very often. Regardless, it should speed up running the function, as getModelFromKEGG only needs to be run once for all models.