nidm:originalFileName -> nidm:filename
nidm:filename is sameAs OBO's digital document name
add: filename attribute in all map entities with location
filename can be attribute of nidm:Image
Merge pull request #169 from cmaumet/originalFilenames

Rename "originalFileName" in "filename" + definition
Use MIME type image/nifti as value for dct:format attribute
Merge pull request #158 from cmaumet/niftiCase

Fix case in "NIfTI"
fix: add missing filename in designMatrix and ExcursionSet
Merge pull request #175 from cmaumet/updateGT

A few fixes in SPM ground truth