Merge branch 'master', remote-tracking branch 'source/master'
configure: fix all except one warning produced by shellcheck

thanks to @bska for pointing this tool out!
Merge pull request #43 from bska/043_cmake

Synchronise build system with opm-core
Merge remote-tracking branch 'source/master'
fix derivative of effective relperm respect to concentration.
Merge pull request #44 from qilicun/fix_eff_relperm

fix derivative of effective relperm respect to concentration.
Merge remote-tracking branch 'source/master'
Fixed build.
Merge pull request #45 from xavierr/master

Fixed build