Don't restrict LossCategory/AssetCategory values.
Don't restrict LossCategory/AssetCategory values.

Discussed in bug https://bugs.launchpad.net/openquake/+bug/800804.


Former-commit-id: 59afa4d1e73ead4ee48006bd660663767c75e572
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine