Remove EE API bucket label param from EE_stageForDownload()

[friedrichknuth]

The label parameter in hipp.dataquery.EE_stageForDownload() should not be exposed, as modifying it can cause issues when interacting with the EE API.

Changing the label prompts the EE API to stage data in a new bucket. If the data were previously requested under a different bucket label the API tells this, but doesn't give much information on how to find them. See old solution to find previously request data in other buckets, though this wasn't stable.

EE_download_images_to_disk() checks what is in the bucket and only downloads what is requested, so switching buckets isn't necessary. Creating this issue with background information in case switching labels is ever desired at some point.