add hack for more stack space in spectral DCM tests #362
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This was a weird little Heisenbug in the Spectral DCM tests. It turns out that if you ran it on a machine with ~8GB of RAM, julia wasn't reserving enough stack space to compile the jacobian code.
An easy work-around around this is to run with more stack space available, but a more satisfying fix would be to clean up some of this code so that it doesn't torture the compiler so badly.
This targets @david-hofmann's #359 PR and should fix #361