Revise Memote tests

[mihai-sysbio]

As part of implementing minimal Memote scoring #3, resolved through PRs #8 and #9), the tests chosen for scoring are:

['test_stoichiometric_consistency', 'test_reaction_mass_balance', 'test_reaction_charge_balance', 'test_find_disconnected', 'test_find_reactions_unbounded_flux_default_condition', 'test_metabolite_annotation_presence', 'test_metabolite_annotation_overview', 'test_metabolite_annotation_wrong_ids', 'test_metabolite_id_namespace_consistency', 'test_reaction_annotation_presence', 'test_reaction_annotation_overview', 'test_reaction_annotation_wrong_ids', 'test_reaction_id_namespace_consistency', 'test_gene_product_annotation_presence', 'test_gene_product_annotation_overview', 'test_gene_product_annotation_wrong_ids', 'test_model_id_presence', 'test_metabolites_presence', 'test_reactions_presence', 'test_genes_presence', 'test_compartments_presence', 'test_metabolic_coverage', 'test_unconserved_metabolites', 'test_inconsistent_min_stoichiometry', 'test_find_unique_metabolites', 'test_find_duplicate_metabolites_in_compartments', 'test_metabolites_charge_presence', 'test_metabolites_formula_presence', 'test_find_medium_metabolites', 'test_find_pure_metabolic_reactions', 'test_find_constrained_pure_metabolic_reactions', 'test_find_transport_reactions', 'test_find_constrained_transport_reactions', 'test_find_candidate_irreversible_reactions', 'test_find_reactions_with_partially_identical_annotations', 'test_find_duplicate_reactions', 'test_find_reactions_with_identical_genes']

This list should be revised, and if possible minimized to contribute to reducing the running time.