Handling common_prefix for score related files

[appukuttan-shailesh]

@apdavison : This line gives problems when we have similarly named output files, e.g. /home/abcd/fig1.pdf and /home/abcd/fig2.pdf. The common prefix evaluates to /home/abcd/fig and the assertion fails.

We could change this to something like:
os.path.dirname(os.path.commonprefix(file_paths)) and then append a /.
This would make the assertion redundant. But I suppose you had certain errors in mind for keeping that assertion there?

[apdavison]

please go ahead and make the change. The assertion was a lazy way to mark this piece of code as needing further work ;-)

[appukuttan-shailesh]

Doing a temporary workaround to handle the above issue and cnr-ibf-pa/hbp-bsp-issues#245
See here: appukuttan-shailesh@9b44966

Temporary fix: all files in a single directory in Collab storage
If subdirs, then saved filename = subdir1_subdir2_....subdirN_filename

TODO improvements:

1. Allow/verify multiple sub-directories of related data (the current fix will club all files into a single base directory)
2. Validation framework app should identify sub-directories in results folder and iterate through these to identify all the individual files

[appukuttan-shailesh]

Related:
HumanBrainProject/hbp-validation-framework#153