Fork or Merge Helomics Data Loading Code

[Jiros]

The Helomics data is not loading correctly and is causing a blocker for the local pipeline implementation. The current code attempts to download several files which no longer exist and fails.

@mpreusse to either:

• fork the original repo into the CovidGraph organisation and fix the errors.
• merge/rewrite the data loading code into one of his other repositories.

The second option is more likely as the original code could also do with some tidying up.