V12: Logical containers should not have `MoleculeProperties`

[PavelBal]

When creating a new Logical container, it should not get the MoleculeProperties node. Now it does:

At the same time, when changing the type of a logical container imported from PK-Sim to "Physical", no MoleculeProperties-node is added:

Proposal:

• When creating a logical container, no MoleculeProperties for this container is created
• When creating a physical container, empty MoleculeProperties is added.
• When changing from logical to physical: add MoleculeProperties
• When changing from physical to logical: Warning "This action will remove all MoleculeProperties of this container, are you sure?". If yes - remove MoleculeProperties and change the container type.

@Yuri05 @msevestre Do you agree that it makes sense?

[msevestre]

@PavelBal Yeah that makes sense to me. Maybe warnign only if the MoleculeProperites cotnainer is not empty