Findopm-parser.cmake: Fix it up, next try

thanks to Arne Morten Kvarving, Bård Skaflestad and Roland Kaufmann
for the discussion.
Merge pull request #601 from andlaus/fix_Findopm-parser.cmake_next_try

Findopm-parser.cmake: Fix it up, next try
fixed: tutorials should include config.h conditionally
added: build system for tutorials
Merge pull request #604 from akva2/build_tutorials

Build tutorials
Merge pull request #1 from OPM/master

merge from master