CLang and recent GCC warn about the "typedef" 'OneColInt' in
AutoDiffHelpers.hpp being unused. Similarly, GCC warns about unused
parameters in various place at level "-Wunused". This change-set
either removes ('OneColInt') or suppresses those messages.
Notes:
- Interface was already present, just disabled.
- Class BlackoilPropsAd cannot properly implement rsMax() with derivatives,
and implements only a throw statement.
Specifically,
- #include <config.h> where appropriate (all .cpp files)
- Adjust include statements to account for sub-directory locations
of .hpp files.
