PSF Cache Directory Not Parsing

[tddesjardins]

In trying to get the psf_cache_dir variable set for testing on the science platform, it does not appear possible to override the default value (via SelectParameter) when creating an ObservationModule object. Example:

obm = ObservationModule(obs, ra=90, dec=30, pa=0, seed=42, cores=6, psf_cache_dir='/home/something/')

does not change the PSF cache directory. Making a local stips_config.yaml directory does successfully work as a workaround, but is not ideal.