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   Data-file structure:

   string             Head for the identification of the experiment
   nn                 number of time/concentration data tupels (<51)
   nmes               number of measured species (<21)
   index              of the measured species in the vector of species
   title              of the exper.(<54 char), as head of the graphics
   t0   c1(0)  c2(0)  c3(0) ...  conc. at zero time of each species (<21)!
   t1          c2(1)  c3(1) ...  tupels whose
   ..    ..     ..          ...  ci(t) have been measured:
   tnn         c2(nn) c3(nn)...  here nmes: 2, index: 2 3
                                 (species 1 not measured)
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Example:

Aufgabe 2.                                 Head text
12                                         number of t/ci points
2                                          two species measured:
1 3                                        species 1 and 3
  t    A2       A        B       C         Title for graphic output
  0.0  0.16000  0.00000  0.1200  0.0000    ci(t=0) of all 4 species of the reaction
 60.0  0.15148  0.11832                    c1(t) and c3(t)
120.0  0.14151  0.11359                    ..        ..
180.0  0.13606  0.10809                    ..        ..
240.0  0.13105  0.10226                    ..        ..
300.0  0.12982  0.09684                    ..        ..
360.0  0.12739  0.08785                    ..        ..
420.0  0.12137  0.08326                    ..        ..
480.0  0.12065  0.07722                    ..        ..
540.0  0.11608  0.07243                    ..        ..
600.0  0.11443  0.06770                    ..        ..
660.0  0.11074  0.06174                    etc.