+ tExaminations: added the booked indication
+ tExaminations: Hospital and wand are optional, due to the fact the examination could be not booked and so we don't know where to do it
+ New tExaminationsProblems table to link the examinations to one or more specific patient problems
+ New tPathologies table: will store the available pathologies
+ New tPatientsPathologies table: will store the pathologies of a patient