Add fsinfo mesh information to some __init__ calls

[dkuegler]

TriaMesh internally calls __init__ in some cases to re-initialize member variables, if inplace operations changed the meshes.
However, when these are called the fsinfo attribute is missing from the call to __init__ resulting in the information in fsinfo getting lost.

I personally, do not really like to use __init__ as a method of the class outside of its use as a constructor. This is probably an example why this would be the case. It makes some differences less explicit and sometimes errors can appear. Maybe it should be considered to move this initialization functionality into an independent method.