Add maximal/largest CMF search option and two small tweaks #3099

Job	Run time
Initial setup	3s
devmirror lint	2m 12s
devmirror abvar/fq bianchi_modular_forms number_fields	4m 12s
devmirror galois_groups siegel_modular_forms	4m 40s
devmirror elliptic_curves hecke_algebras tests	2m 0s
devmirror hilbert_modular_forms sato_tate_groups tests	2m 33s
devmirror api characters cluster_pictures ecnf local_fields	8m 38s
devmirror belyi higher_genus_w_automorphisms hypergm lattice maass_forms tests users	1m 47s
devmirror artin_representations genus2_curves	4m 35s
devmirror classical_modular_forms	7m 50s
devmirror lfunctions	3m 44s
devmirror groups/abstract	6m 48s
devmirror modular_curves	8m 34s
	57m 36s

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