Tool randomfield may use current time stamp as seed now

[reetzelhaft]

The tool randomfield creates random numbers based on a seed that can be specified as input. The default value is seed=1. Thus, if no seed is specified, the generated FlowField is always the same.

I changed the tool to use the current time in second as the seed value, if seed is initially set to 1 (the default). Now,

• Set the seed to a number different from 1 to create always the same FlowField.
• Do NOT set the seed to have "random" behaviour.

PS: The random number generator is called in the function randomReal(a,b) in mathdefs.h.

[codecov-commenter]

Codecov Report

Merging #25 into patch_2020 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           patch_2020      #25   +/-   ##
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  Coverage       26.84%   26.84%           
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  Files              64       64           
  Lines           15730    15730           
  Branches         6815     6815           
===========================================
  Hits             4222     4222           
  Misses          11470    11470           
  Partials           38       38           

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