Adds scripts/fifa17-discard-impact.py (owned-instance economic impact, computed
from the shipped implementation's matrix -- informational, never a reason to
alter a value) and records the measured results.
Owned club, 1993 instances: legacy 1,820,700 -> recovered 19,128,031 = 10.51x.
Players 10.53x, manager 1.88x, consumables 0.19x (the ladder overpaid them ~5x),
staff 0.24x, club items 900 -> 0.
funman300