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now it seem that I have a problem with the data types store in the ValueSet.

fiberNavigator

matrix directly.

[---] the previous commit accidentally commited also the following:
 * first part of WNIfTILoader tests.
 * handling of program_options' exception if an invalid option is given

deleted it.

Please see the TODOs regarding the co-existence with WOptionHandler.

[ADD] exception when bad file stream encountered

- now it prints logs directly when compiled in debug mode
- it uses fancy colors for better reading

[CHANGE] - now using ONE composite viewer for all WGEViewer