Documentation: clarify version numbers and fix minor issues

Remove references to "current" version numbers, use 1.2.3 as example
for clarity and to simplify version number updates.

Also: minor textual fixes (typos), unwrap lines, etc..

Todo: Documentation states:
  "This file is not actively maintained any more, but is left here
   as a reference, until the doxygen documentation is completed."

  Check if the documentation generated by doxygen from source files
  contains everything needed so this file can be removed.

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