Update Chapter_8.tex
Automatic (brew) OSX install of gnuplot , better dependency check
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small fix to konvex def
Correct one letter and Satz number

The Satz numbers are wrong in the note anyway but 8.40 (from the notes) follows the 8.39 from line 1333
Restore erased $
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Change prime to "first composant"

This was already discussed. Some 1s are written like ' but in this case it's a composant number and not a derivative
Correct function description in definition 8.57

Omega is not in R^n but a subset as written in Struwe's script p. 177. This is a mistake in the notes.
The function described is from Omega to R^l
Correction to definition 8.57

df(x0) is a vector composed from the differentials of each component f^i of f
Correct dimension

g maps to R^2 and not R^3
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