Minor updates to HistoricalLayer and usage of BurnMD data

[afennelly-mitre]

Resolves #37.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
simfire/game
game.py	198	25	87%	50, 76–80, 250–251, 292–293, 311–315, 344, 346, 348, 353, 356–363, 389, 402–403, 406–407
image.py	19	2	89%	20, 31
sprites.py	178	6	97%	81, 87, 92, 98, 341, 447
simfire/game/managers
fire.py	204	5	98%	223, 265–269, 643, 782
mitigation.py	44	1	98%	73
simfire/sim
simulation.py	419	122	71%	73, 83, 93, 103, 113, 129, 140, 150, 170, 181, 324, 416–423, 457–478, 549, 615–628, 648–661, 679, 696, 768, 805–806, 808–809, 839, 858, 871, 892–959, 1020–1024, 1043–1054, 1068–1106
simfire/utils
config.py	508	151	70%	70–83, 112, 224, 239–240, 245–246, 253–254, 270, 284–291, 316–336, 347–354, 367, 405–407, 425–427, 429–431, 450–461, 583, 598, 602, 606, 616–618, 649–700, 719, 730–731, 734, 738, 747–752, 765–773, 794, 800, 804, 814–822, 833, 868–893, 916, 923, 931, 949–973, 1067, 1080, 1103, 1112–1133
decorators.py	13	8	38%	15–23
generate_cfd_wind_layer.py	81	68	16%	23–32, 36–54, 58–66, 70–80, 86–120
graph.py	67	6	91%	107–108, 113, 119, 227, 252
layers.py	465	230	51%	96, 100–101, 148–153, 194, 212, 219, 296–306, 390–399, 402–443, 449–456, 637, 666, 820–852, 857–888, 897–917, 926–930, 947–1042, 1049–1055, 1069–1080, 1092–1101, 1110–1143, 1155–1176, 1195–1203
log.py	32	10	69%	11–12, 15–16, 21, 27, 36–38, 41
terrain.py	38	8	79%	127–136
units.py	27	4	85%	15–16, 29–31
simfire/utils/_tests
test_layers.py	89	3	97%	102, 131, 192
simfire/world
elevation_functions.py	24	1	96%	100
simfire/world/wind_mechanics
cfd_wind.py	150	39	74%	63–73, 76–95, 130–134, 140–144, 188, 272, 274, 279, 281
perlin_wind.py	35	1	97%	42
wind_controller.py	66	37	44%	119–146, 157–170, 173, 176, 179, 182, 185
TOTAL	3879	727	81%

Tests	Skipped	Failures	Errors	Time
97	0 💤	0 ❌	0 🔥	2m 22s ⏱️

[doyled-it]

Just the one comment I have on fire start location being (y, x) or (x, y)