Minimal changes to jacobian in calculus.jl to allow for nonsquare Jacobians #355

Job	Run time
pre_job	7s
pre_job	7s
Julia 1.6 - ubuntu-latest - 1 thread(s) - pull_request	3m 35s
Julia 1.6 - ubuntu-latest - 1 thread(s) - pull_request	3m 35s
Julia 1.6 - macOS-latest - 1 thread(s) - pull_request	3m 45s
Julia 1.6 - macOS-latest - 1 thread(s) - pull_request	3m 45s
Julia 1.6 - windows-latest - 1 thread(s) - pull_request	12m 12s
Julia 1.6 - windows-latest - 1 thread(s) - pull_request	12m 12s
Julia 1 - ubuntu-latest - 1 thread(s) - pull_request	7m 39s
Julia 1 - ubuntu-latest - 1 thread(s) - pull_request	7m 39s
Julia 1 - macOS-latest - 1 thread(s) - pull_request	8m 30s
Julia 1 - macOS-latest - 1 thread(s) - pull_request	8m 30s
Julia 1 - windows-latest - 1 thread(s) - pull_request	8m 20s
Julia 1 - windows-latest - 1 thread(s) - pull_request	8m 20s
Julia nightly - ubuntu-latest - 1 thread(s) - pull_request	7m 48s
Julia nightly - ubuntu-latest - 1 thread(s) - pull_request	7m 48s
Julia nightly - macOS-latest - 1 thread(s) - pull_request	11m 9s
Julia nightly - macOS-latest - 1 thread(s) - pull_request	11m 9s
Julia nightly - windows-latest - 1 thread(s) - pull_request	3m 29s
Julia nightly - windows-latest - 1 thread(s) - pull_request	8m 20s
Julia 1 - ubuntu-latest - 2 thread(s) - pull_request	8m 5s
Julia 1 - ubuntu-latest - 2 thread(s) - pull_request	8m 5s
	2h 34m 9s

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