FamStructWrapper: incorrect Clone implementation

[lauralt]

Clone implementation for FamStructWrapper keeps only the number of entries and the entries array members. This implementation should be either removed or modified so that all fields are cloned.

[Twister915]

I'm trying to understand this issue, please correct me if I'm wrong. A FAM struct, in the typical case, just has length and a bunch of entries. Therefore, in this case, the Clone implementation is correct. However, FAM isn't strictly length + entries, but can instead be something like: ... other fields ... + length + ... other fields ... + entries, and this is the case that Clone does not currently handle correctly. If that's correct, then I think if #104 is addressed first, then this should be pretty straight-forward.

[andreeaflorescu]

@Twister915 I find it to be the other way around. We already support other fields in FAM Struct, but the clone is implemented such that only the entries and length are cloned. This makes the Clone implementation wrong, and as a consequence, the FamStructWrapper implementation also wrong (in the scenarios where clone is needed). Once we fix the clone, and add a few tests with FAM structs that have more fields, we can close both issues.