Densities, random walks & travelling salesman #1465

Job	Run time
get-commit-message	3s
test-cpu (finufft)	19m 6s
test-gpu (cufinufft)	15m 0s
test-cpu (pynfft)	4m 21s
test-gpu (gpunufft)	15m 41s
test-cpu (sigpy)	4m 23s
test-gpu (torchkbnufft-gpu)	14m 53s
test-examples	22m 9s
Build API Documentation	0s
coverage	23s
Compile the coverage badge in docs	0s
	1h 35m 59s

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