Made a workaround for passing all channels to pixel classifier; stable export script using this from multiposition CZIs

Implemented utility functions to export subblock and XML data from CZI files, as well as to return a single position's accessor from a multiposition file

Corrected argument-forwarding error; set up job for porto data; split off ecotaxa TSV generation into its own module

Validated non-duplication when loading ilastik model with same project file name, irrespective of path formatting