Oblig 5 assignment text corrections

EDIT: the assignment text has been updated. - K

Some points that we forgot to update in the new Oblig 5 assignment text:

• Pages 6-7: 'TegnUt' has been renamed to 'Oblig5Precode'
• Description for fig1 says that the points shown in the figure are the ones we'll be using in the assignment. This is not necessarily correct because the seed for generating the points is to be specified by you instead of us.
• Page 7, 1b: a call to drawGraph() and writeHullPoints() is also required for output after creating an object from Oblig5Precode