vulnerability checks too strict

[benhayes21]

vulnerabilitytobin includes the validate vulnerability function to ensure that converted files follow the recommended file structure, but these include recommendations that are not required for the file.

The result is that "valid" files can fail on conversion, but because the process checks and writes at the same time, we see partial converted binary files. If the failure message is not seen by the user (or the process is automated), we end up with partial vulnerability.bin files.

Recommendation is that we relax/update the validation checks to ensure only those that are required for gulcalc/gulpy/gulmc to complete successfully.