Discuss whether `path` and related properties are required.

[led02]

Testing of the path property of ld_container (#395) revealed that the SOC principle is broken by the instance maintaining the state within it's parent.

We should discuss whether the path property should be removed (as it is mostly used by merging to keep track of changes).
If we keep it, at least some sanity checks should be added to the constructor of ld_container.