Copying files from Workspace to Home via Girder API uses wrong assetstore

[Xarthisius]

When copying files from a workspace to user's home directory using POST /resource/copy, the actual bits end up in GridFS assetstore, even though destination path is /user/{}/Home.

Expected behaviour

Copied files end up in wt-homes assetstore

How to reproduce?

1. Create a Ligo Tale (https://github.com/whole-tale/deploy-dev/blob/dev/register_ligo.py)
2. Launch Ligo Tale
3. Navigate to Run > Files > Tale Workspace
4. Select dropdown next to readligo.py, click on "Copy to Home"
5. Navigate to Run > Files > Home (file should be present)
6. In Jupyter Notebook navigate to home/ (file is not present)

[Xarthisius]

Fixed by #29