spidyan/saffron: add controls for the integration time and the data points that are recorded for detecting

[stestoll]

Original report by Stephan Pribitzer (Bitbucket: 557058:b436f856-3789-41af-afc1-0e3566ff0302, ).

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Proposal:

Opt.IntTimeStep: 30 times Nyquist

Exp.DetTimeStep: 2 times Nyquist

• nothing given - by default the programs assumes default values
• both are given - if Exp.DetTimeStep is not a multiple of Opt.IntTimeStep, an error is returned
• only Exp.DetTimeStep is given - Opt.IntTimeStep is adapted by shortening
• Opt.IntTimeStep is given - use Nyquist criterion to compute Exp.DetTimeStep

[stestoll]

Original comment by Stephan Pribitzer (Bitbucket: 557058:b436f856-3789-41af-afc1-0e3566ff0302, ).

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with commit #256a686 the time axis is now created correctly. tests were added.

however, a new problem arises during down conversion. if the detection time step is not the integration time step, oscillations are not completely removed - the source of this needs to be investigated