max_* values in Snakefile_model_eval

[vineetbansal]

Currently these 3 are set to 50k each in Snakefile_model_eval:

• max_molecules
• max_orig_mols
• sample_no

1. Make naming consistent
2. Investigate whether its better to leave any/all of these as None, and override in specific cases for performance reasons.

[anushka255]

Variable names max_orig_mols and sample_no have been updated to max_molecules, but there's still a lingering variable name,max_mols, which can be renamed to max_molecules. I also don't think the second bullet point in this issue has been investigated.