Modify structure.oebin to remove missing probe folders [openscope]

[bjhardcastle]

The upload pipeline currently crashes if there are probes in the structure.oebin file that aren't present in the recording folder. Currently, this affects openscope sessions, where only the raw data for inserted probes has been uploaded to lims: non-inserted probes are listed in structure.oebin, but their data is missing at the point of upload.

The actual failure happens during compression, when metadata is parsed in order to find data folders:
https://github.com/NeuralEnsemble/python-neo/blob/master/neo/rawio/openephysbinaryrawio.py#L79

• add a function to upload.py to "fix" the metadata
  • should run after creating ephys symlinks
  • read structure.oebin file's contents (np_tools has a helper function for this)
  • iterate over all devices in relevant sections
    • check if each device folder exists
  • for all that don't exist, remove everywhere in the file contents
  • overwrite the symlink with a new modified file: CAUTION be careful not to modify the file original!