Vector default constructor can only lead to SEG-faults

[willGraham01]

Vector class is declared in arrays.h

Vectors can be created without assigning their elements, IE the attribute Vector.vector can be nullptr if one uses the default constructor.

This can potentially lead to seg faults, since one could then run

Vector<double> v;
v[0];

What is particularly odd is that once created, Vector has no method to assign (or reassign) a valid block of memory to vector.

As such, it doesn't seem to make sense as to why we should allow creation of this object in this way. The default constructor for Vector should be removed, and the classes that have Vector attributes should be checked over for similar issues.