Browser Caliban should be able to load files from bucket even if they are not in a subfolder about deepcell-label HOT 3 CLOSED

The dropdown list of files on the landing page are now all preloaded into a subfolder called 'test' in the input S3 bucket. To add more files to the landing page, developers only need to

1. Update the dropdown menu in form.html to add the file option to the list
2. Upload the file to the 'test' subfolder in our S3 bucket.

from deepcell-label.

Also, verified that Caliban is able to access files even if they are not in subfolders in S3 bucket. For example, calling something like http://0.0.0.0:5000/caliban-input__caliban-output__test.npz will work as long as test.npz is in the input S3 bucket and is not in a subfolder.

from deepcell-label.

Implemented in #63, note that uploading scripts such as in deepcell-toolbox will need to account for this when creating links to files. The format for the filenames that browser caliban can open is:
"{input bucket}{output bucket}{subfolders separated with }{filename.npz or .trk}". Each field is separated by two underscores, and the file can be in an arbitrary number of nested subfolders as long as each folder name is also separated with "__".

from deepcell-label.