Add Finder Chart Maker

[emirkmo]

Fixes #21

Begins also working on #24, the second endpoint is now called make_fc.py.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
flows_finder
__init__.py	0	0	100%
argparser.py	0	11	85%	104, 109, 120, 147, 150, 153, 172–176
auth.py	0	9	52%	13–16, 20, 22–23, 35–36
catalogs.py	0	6	90%	45, 74, 136–137, 145–146
corner.py	0	7	50%	8–12, 18, 28
instruments.py	0	30	78%	21, 25, 29, 33, 37, 42, 47, 51, 55, 104, 107–114, 140–144, 186, 189–194
make_fc.py	0	8	61%	21, 24, 27, 30, 33, 35–36, 40
observer.py	0	11	88%	43–44, 57–58, 71, 83–84, 86, 90, 92–93
plan.py	0	0	100%
plots.py	0	74	55%	30, 51, 125, 195, 201–208, 213–222, 224, 230, 233–242, 251–252, 254, 257, 267, 272, 281, 283, 285, 290–303, 305–307, 309, 311–316, 318–323, 327
run_get_brightest.py	0	9	59%	21, 24, 27–29, 32–34, 38
target.py	0	7	75%	19–20, 24–25, 27–29
tests.py	0	5	96%	28–30, 144–145
utils.py	0	15	60%	33–36, 38–41, 45–48, 55, 59–60
version.py	0	0	100%
TOTAL	861	192	77%