Remove ForestFire and use estimates for Mason benchmarks

[Tortar]

Estimates are based on the difference between small and large versions, which should roughly account for the start-up time

julia> (274.612728 - 208.459404) / (92.25591 - 10.777566)
0.8119129667141983

julia> (2857.646180 - 206.822735) / (142.291736 - 3.07503)
19.040986683020645

julia> (239.218375 - 157.989654) / (33.609804 - 2.022232)
2.5715405096662702

We will actually use the CI work when #68 is solved