made Importer `zarr´ compatible

[jo-mueller]

Description

Fixes #97

This PR implements the fixes suggested by @will-moore in this image.sc thread to allow for the import of .zarr files into OMERO through ezomero.

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.

[erickmartins]

I'm going to suggest that, instead of hardcoding that, ezimport can take extra arguments that get passed through to the import call at CLI level. This way, if we ever need --depth 20, or if folks need to pass any other optional import arguments, that doesn't require any code change.

[jo-mueller]

@erickmartins thanks for the feedback. Do you mean adding it as a keyword argument to the Importer class?

[erickmartins]

I mean adding *args, **kwargs to the ezimport function signature, and passing these through to the omero import call there (changing imp_ctl.ezimport() to imp_ctl.ezimport(*args, **kwargs)). In fact, that would also mean getting rid of the ln_s optional parameter and the ezimport_ln_s method.

[erickmartins]

db4f409 is more or less what I had in mind here - it means users can pass extra arguments directly into ezimport and they get sent to omero import. in that case, making it work for zarrs would just mean calling ezimport(conn, "/path/to/file.zarr", depth=10), doing in-place imports would just be calling ezimport(conn, "/path/to/file.tiff", transfer="ln_s") and so on.

[jo-mueller]

Thanks for working on this! I'm on parental leave until early April so thanks big-time for the fix :)