Enabled multi-ini recognition
Addressed all points in https://github.com/gem/oq-commonlib/pull/53
Merge pull request #53 from gem/oq-lite

Examples, tests and notebook for the feature of oq-lite
Further work on the source splitting/filtering
Improved the validation of vulnerability models
Merge pull request #55 from gem/fix-vulnerability-functions-validation

Improved the validation of vulnerability models
Reverted the check on duplicated vulnerabilitySetID
Merge pull request #56 from gem/fix-vulnerability-functions-validation

Reverted the check on duplicated vulnerabilitySetID
Merge branch 'master' into get_trt_models
Added a weight to the Source tuple
Added TrtModel.split_sources