Adaptation to changes introduced in EMB v0.7

[JulStraus]

EnergyModelsBase v0.7 changed how Storage nodes are handled through the introduction of a StorageBehaviour and AbstractStorageParameter.

As a consequence, we had to update EMRP to support the new structures.
This PR closes Issue 17.

@hellemo : Do you think the changes warrant an increase to 0.6 or is 0.5.7 sufficient? It includes most likely breaking changes for node development, but not for application through the introduction of the constructors. In practice, other packages should not depend on EMRP. Hence, I would argue that 0.5.7 should be ok.

Draft status until we decided version increase and I updated the NEWS.md

[hellemo]

I guess you could argue that because most of these changes are to support the breaking EMB release, this doesn't need to be breaking?

On the other hand, there are some new types, I didn't look to carefully if they are backwards compatible, but since this is for users upgrading to the new (breaking) EMB version, I think it is better and less confusing to release as v0.6.0, as users will need to update dependencies anyways.

[JulStraus]

I guess you could argue that because most of these changes are to support the breaking EMB release, this doesn't need to be breaking?

On the other hand, there are some new types, I didn't look to carefully if they are backwards compatible, but since this is for users upgrading to the new (breaking) EMB version, I think it is better and less confusing to release as v0.6.0, as users will need to update dependencies anyways.

I agree. We do not add any new types in this PR, but we remove an older constructor. Given that, it makes sense in my opinion to go to 0.6.