Added hdf5 export to the demos
Added hdf5 export to the demos


Former-commit-id: 6208dcb24120528eab4ef9c1ec84a1fb2731f30c [formerly 6208dcb24120528eab4ef9c1ec84a1fb2731f30c [formerly 039cc5ef801dae4dc552986caaa14ed85ead6699]]
Former-commit-id: 9677deb37274fb582665db77a5051280b06f2fa9
Former-commit-id: 165259ed3c80846a57290dc09e7fbdc8ccc586c6
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine