;Task
Implement a Vector class (or a set of functions) that models a Physical Vector. The four basic operations and a ''pretty print'' function should be implemented. 


The Vector may be initialized in any reasonable way.
* Start and end points,  and direction
* Angular coefficient and value (length)


The four operations to be implemented are:
* Vector <big><b> + </b></big> Vector addition
* Vector <big><b> - </b></big> Vector subtraction
* Vector <big><b> * </b></big> scalar multiplication
* Vector <big><b> / </b></big> scalar division
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