This commit switches a set of OPM-Common's unit tests away from
using direct calls to libecl functions and into using base types
from OPM-Common itself (along with Boost.Filesystem).
In particular summary related queries are replaced by calls to ESmry
member functions (wrapped in libecl-like interfaces to minimise code
changes). We disable checks on unit strings since ESmry currently
does not have a way of associating those with individual variables.
c013639b51