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And minor bugfixes.

Still working only on one file. Needs to be extended to more than one.

Add sampling_rate, start and endtime to the TDMS class.

Filename is internally created based on dir, experiment and timestamps.
First additions to support timewindow selection.

Still needs to be tested.

All objects, its properties and its values can be read.
Functions are included to cope with the different types of data as well as how
they are represented in a TDMS file.