Exercise and Weight graph

Merged Log and Graph
Renamed WeightManagement.aspx to WeightLogGraph.aspx
Refactored WeightModel.aspx, Weight.aspx, and WeightLogGraph.aspx
Provide links on the Menu to record_weight.aspx and
Exercisemangement.aspx

Because I had to develop a log and graph for exercises I
(a) Renamed Exercise.aspx to ExerciseType.aspx
(b) Renamed ExerciseFactory.aspx to ExerciseTypeFactory.aspx
(c) Renamed ExerciseAdmin.aspx to ExerciseTypeAdmin.aspx