reminder: add header to output files

Low-priority reminder issue for text file headers, as briefly discussed in #8 (closed):

David: generally add a header with all search parameters (also beneficial for data archiving and external postprocessing

Greg: Nevertheless, adding a header as is done by CFSv2 is something on my to-do list (also for the MCMC output)

Edited Dec 18, 2017 by David Keitel

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