add: summary level database descriptor
add: summary level project descriptor
add: version level descriptor
add: distribution level component descriptor
add: distribution level aggregate descriptor
rm: generic descriptor
add: experiment project level
add: experiment study question level
add: experiment mr study level
add: experiment acquisition level
remove stat image properties entity and move attributes to searchSpace
fix: missing comma
Update domain: StatisticImageProperties -> SearchSpace
Merge pull request #160 from cmaumet/fixSPMGroundTruth

Fix: SPM ground truth
Merge pull request #132 from cmaumet/statImagePropInSearchSpace

Definition of "StatisticImageProperties"
fix: contrast estimation activity used mask
softwareRevision = beta
fix: search space is in .nii.gz
fix: add dot:format in search space
Remove term spm:StatisticImageProperties (as agreed in #132)