Add support for multiple patch transform files

[markus-hinsche]

Problem: patch transforms only supports a single file

patch:
  transforms: 
    - path/to/patch/transforms.py
    - path/to/patch/transforms2.py

Use case: In https://github.com/kbressem/transforms, we have multiple files with transforms, and we can test them by combining them. Currently I have

patch:
  transforms: transforms/MultiClassSegNrrdToOneHot.py

but I would like add transforms/NrrdReader.py

Solution

• change trainlib to accept a list in the config (instead of a single string)

[kbressem]

Correct. Only one file is supported. But should be fixable.