Some minor corrections (updated in …

Some minor corrections (updated in the resp. documents): (i) syllabus: section 7.2 is not in the syllabus, (ii) the hint in Ex.1 in notes on convexity: triangle ineq. (not Cauchy-Schwarz), (iii) in lecture notes on sensitivity analysis (p. 23 Eng. and 22 Norw.): the opt. value (eta-star) will change, but the main thing is that x^*_B does not change.